TWRP Recovery with UBIFS Support For Amlogic Nextbook Tablets (Support Thread)

[luizjkk]

Rom Tablet NEXT7D12R

How is the development of the rom for the NEXT7D12R?

[shaunmt]

Internal SD (EMMC) Mounting Errors

I've identified the cause for EMMC mounting errors on some models and fixed it.

I will upload new TWRP builds for ALL models as soon as I have time to get them built and packaged.

I think I also have a few additional models that will be added at the same time.

ShaunMT

[shaunmt]

Hello! ShaunMT

Here is the original build.prop from my Next7P12-8G Tablet that I did a rom dump
when I bought it back in Sept. 2013, that you asked for.
I hope it can be useful to you!

Yeah that matches one of the ROMs I'm working on... As far as I can tell, there are only two different versions and the only difference is the WiFi chip.

I'm about to release a custom ROM based on a newer build date with the same WiFi chip as yours, along with an even newer build with the other WiFi chip.

ShaunMT

[GJPete5580]

I'm aware that there are two different versions of the Next7P12-8G, with different WiFi chips, but they should both be able to use the same recovery... I know the recoveries are compatible, or people couldn't flashed the ROM with the wrong WiFi chip, as so many did.

If you used the 4G recovery to flash your tablet, be sure to check your partition sizes, as it may have shrunken them... the partition map is har d coded in the boot and recovery kernels.

Also be aware, that serial numbers do not identify tablet models or versions... "YFG0713" means manufactured by Yifang (YFG) in July of 2013 (0713). It could be anything they made that month. Multiple models names or multiple versions of same model name could also be "YFG0713". It's best to compare build.prop file entries to verify if two devices or ROMs are compatible, although even the build.prop may not always be sufficient, as is the case with the WiFi chips in these models, because they didn't change the board name and we don't know the exact date they changed the WiFi chip.

If you have an "original" stock build.prop I'd like to see it.

ShaunMT

Hello! ShaunMT

Here is the original build.prop from my Next7P12-8G Tablet that I did a rom dump
when I bought it back in Sept. 2013, that you asked for.
I hope it can be useful to you!



# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=IMM76I
ro.ota.version.id=V2.0.5.IMM76I.eng.root.20130618
ro.build.display.id=IMM76I.v005
ro.build.version.incremental=eng.root.20130618.142 933
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.4
ro.build.date=Tue Jun 18 14:31:16 CST 2013
ro.build.date.utc=1371537076
ro.build.type=user
ro.build.user=root
ro.build.host=lscao
ro.build.tags=release-keys
ro.product.board=NXM727MC_WM
ro.product.cpu.abi=armeabi-v7a
ro.vendor.name=YFMID
ro.product.model=Next7P12-8G
ro.product.brand=Nextbook
ro.product.name=M727MC
ro.product.device=M727MC
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=YIFANG
ro.wifi.channels=14
ro.board.platform=meson3
# ro.build.product is obsolete; use ro.product.device
ro.build.product=NXM727MC_WM
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=NXM727MC_WM-user 4.0.4 IMM76I eng.root.20130618.142933 release-keys
ro.build.fingerprint=Nextbook/M727MC/M727MC:4.0.4/IMM76I/v005:user/release-keys
ro.build.characteristics=tablet
# end build properties
# system.prop for M1 reference board
# This overrides settings in the products/generic/system.prop file
#
#rild.libpath=/system/lib/libreference-ril.so
#rild.libargs=-d /dev/ttyS0
ro.sf.lcd_density=120
keyguard.no_require_sim=1
#set keyguard.enable=false to disable keyguard
keyguard.enable=true
ro.statusbar.widget=true
ro.statusbar.button=true
ro.statusbar.yearmonthdayweek=true

#wifi.interface=ra0
# Time between scans in seconds. Keep it high to minimize battery drain.
# This only affects the case in which there are remembered access points,
# but none are in range.
#wifi.supplicant_scan_interval = 60
#alsa.mixer.playback.master=DAC2 Analog
#alsa.mixer.capture.master=Analog
#configure the Dalvik heap for a standard tablet device.
#frameworks/base/build/tablet-dalvik-heap.mk
dalvik.vm.heapstartsize=5m
dalvik.vm.heapgrowthlimit=40m
dalvik.vm.heapsize=256m

hwui.render_dirty_regions=false

# Disable un-supported Android feature
hw.nopm=false
hw.nobattery=false
hw.nophone=false
hw.istablet=true
hw.novibrate=true
hw.has.accessibility.accel=false
hw.cameras=1
hw.hasethernet=false
hw.hasdata=true
ro.platform.has.touch=true
hw.nodatausage=true
# Wi-Fi sleep policy
ro.platform.has.sleeppolicy=false
#set to 0 temporarily so touch works without other changes
ro.sf.hwrotation=270
#0~7 You are required to get the correct install direction according the sensor placement on target board
ro.sf.gsensorposition=4
ro.sf.ecompassposition=4
allow_all_orientations=1

# Use OSD2 mouse patch
ro.ui.cursor=osd2

# Enable 32-bit OSD
sys.fb.bits=32

# Disable GPS
gps.enable=false

# Enable player buildin
media.amsuperplayer.enable=true
media.amplayer.enable-acodecs=asf,wav,aac,m4a,ape,flac,alac
media.amplayer.enable=true
media.amsuperplayer.m4aplayer=STAGEFRIGHT_PLAYER
media.amsuperplayer.defplayer=PV_PLAYER
media.amplayer.thumbnail=true

# Status bar customization
ro.statusbar.widget.power=true
ro.statusbar.yearmonthdayweek=true

# HDMI
ro.hdmi480p.enable=true
rw.fb.need2xscale=ok
media.amplayer.osd2xenable=true

#camera DCIM dir. 0:sd only; 1:nand only; 2,sd first
ro.camera.dcim=1

# Disable preload-class
ro.amlogic.no.preloadclass=0

# App optimization
ro.app.optimization=true

#Dual display
ro.vout.dualdisplay2=true

#For 800x480 UI
ro.platform.UI.800x480=true

#For Erase internal SD card
hw.erase.internalSdcard=true

#audio effect
ro.audioEffectEnabled=true

#Encrypt tablet
#ro.platform.has.security=false

#YF prop
ro.yifang.devicename=Next7P12-8G
ro.yifang.lcd=1
ro.yifang.hotpoint=1
ro.yifang.hdmi=false
ro.yifang.weather.city=New York
ro.yifang.weather.isf=1
ro.yifang.ota.enable=1
ro.fontScale=1.15
virtualsd.enable=true
ro.keyguard.orientation=landscape

#hdmi settings
ro.hdmi.has.settings=false

#used forward seek for libplayer
media.libplayer.seek.fwdsearch=1

#enable address bar cover issue fixing
ro.flashplayer.surfacehack=1

#google client prop
ro.com.google.clientidbase=android-anydata
#enable widevine
media.amplayer.widevineenable=true

#used to set default surface size, set 1 when hwrotation is 270;
media.amplayer.stopbuflevel=0.002
ro.anydata.checkin=true

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.opengles.version=131072
ro.config.notification_sound=OnTheHunt.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
drm.service.enabled=true
ro.setupwizard.mode=DISABLED
ro.com.google.gmsversion=4.0_r4
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.hardware.version=1.0.0.0
ro.vendor.name=YFMID

[shaunmt]

Hello! ShaunMT

As I mentioned in an earlier post that I have problems with the
TWRP Recovery on my Next7P12-8G Tablet. And I cannot boot into
the internal recovery. I think it may be corrupted or worse.


I thought I would let you know that I took a chance and used the TWRP Recovery file: SMT_TWRP_Next7P12-4G-POM727MC_1G.zip
for my Next7P12-8G Tablet and it worked! I was able to backup my tablet and then flash your modified stock ROM.
However, WIFI would not work after the flash, so I restored the backup and WIFI is working.

I came across a post in this forum by member Madscientist687 who created a modified stock ROM based on
the Next7P12-8G Tablet with serial #YFG0713..... which is the one I have. So, I flashed it and every thing is
working including the WIFI!

So far I have not experienced any problems by using SMT_TWRP_Next7P12-4G-POM727MC_1G TWRP Recovery.
But, I cant wipe internal storage it fails also, cant do factory reset it also fails.



Thanks Again! For all of your great work with these Nextbook Amlogic Tablets.

I'm aware that there are two different versions of the Next7P12-8G, with different WiFi chips, but they should both be able to use the same recovery... I know the recoveries are compatible, or people couldn't flashed the ROM with the wrong WiFi chip, as so many did.

If you used the 4G recovery to flash your tablet, be sure to check your partition sizes, as it may have shrunken them... the partition map is har d coded in the boot and recovery kernels.

Also be aware, that serial numbers do not identify tablet models or versions... "YFG0713" means manufactured by Yifang (YFG) in July of 2013 (0713). It could be anything they made that month. Multiple models names or multiple versions of same model name could also be "YFG0713". It's best to compare build.prop file entries to verify if two devices or ROMs are compatible, although even the build.prop may not always be sufficient, as is the case with the WiFi chips in these models, because they didn't change the board name and we don't know the exact date they changed the WiFi chip.

If you have an "original" stock build.prop I'd like to see it.

ShaunMT

[GJPete5580]

/emmc may not mount in TWRP, but that is ok.

I think you may have two different problems... unfortunately I don't own this model to do any testing on...

I really can't even attempt to determine what may be wrong with your internal recovery partition. I think the best way to address that issue would be to reflash the ROM...

It does sound like you might have a problem with your internal and / or external SD card...

You should be able to erase / reformat the internal SD card from the android system settings. That may help, especially considering the external SD card is mounted as a folder in the internal SD card...

You might also want to reformat your external SD card to FAT32 using a PC.

In regards to not being able to swipe the slider in TWRP... it is difficult to do on some of the models that I own... this is one of the reasons I did not previously release TWRP... I suspect this is why you can't swipe yours...

On some of the models I own, the slider and buttons in TWRP work perfectly...

On other models, I've found that the touch reactive point seems to be slightly above or below center of the graphic... once you figure out where it is, it easy to get used to.

For the slider, try placing your finger in the center of the circle, or halfway between the center and top, or halfway between the center and bottom of the circle... don't swipe, just touch it and hold your finger there and wait to see if it reacts... if it does, carefully slide straight to the right from that point...

That should enable you to flash, wipe, etc...

ShaunMT

Hello! ShaunMT

As I mentioned in an earlier post that I have problems with the
TWRP Recovery on my Next7P12-8G Tablet. And I cannot boot into
the internal recovery. I think it may be corrupted or worse.


I thought I would let you know that I took a chance and used the TWRP Recovery file: SMT_TWRP_Next7P12-4G-POM727MC_1G.zip
for my Next7P12-8G Tablet and it worked! I was able to backup my tablet and then flash your modified stock ROM.
However, WIFI would not work after the flash, so I restored the backup and WIFI is working.

I came across a post in this forum by member Madscientist687 who created a modified stock ROM based on
the Next7P12-8G Tablet with serial #YFG0713..... which is the one I have. So, I flashed it and every thing is
working including the WIFI!

So far I have not experienced any problems by using SMT_TWRP_Next7P12-4G-POM727MC_1G TWRP Recovery.
But, I cant wipe internal storage it fails also, cant do factory reset it also fails.



Thanks Again! For all of your great work with these Nextbook Amlogic Tablets.

[sssteeve]

I think it might be the hardware, but if i dont use it for awhile then it works fine, but then soon it doesnt work right again.

This might be completely unrelated but the power button on my 8P12 got very "flaky"- I could see that it was recessed a bit compared to the other buttons. I could turn it on and off just fine using my thumbnail. At least until it broke completely. When I took it apart I found that the power switch bracket was soldered to the printed circuit board, and that it had come loose on one side. At that point it was too far gone for a quick fix with Krazy Glue. I saved the battery and scrapped the rest.

Taking apart the 8P12 was fairly easy. There is a small phillips head screw under the SD card flap and once you remove that you can start prying up on the soft rubber back. One tip: put a little tape to hold the power and volume buttons in place in the case when you remove the guts.

sssteeve

[shaunmt]

Hello! ShaunMT

As I mentioned in an earlier post that I have problems with the
TWRP Recovery on my Next7P12-8G Tablet. And I cannot boot into
the internal recovery. I think it may be corrupted or worse.
Cannot boot into the CWM recovery either.

TWRP reports that 'free space 0 MB' on the internal storage.

I also get the following errors:
E: unable to mount '/emmc'
E: updating partition details...
E: unable to mount internal storage
E: unable to mount /emmc during GUI startup
E: unable to mount '/emmc'

I try to backup to the external sdcard which TWRP
reports 2489 MB Free Space.

But, when I try to swipe to backup it will not
respond. It will not swipe it just wont respond
to my touch and swiping to the right.

When I boot into the system the internal storage
reports that there is 6.29 GB of free space.
And I can download and store files, video, etc.
However, if I try to boot into recovery the
data on the interal sdcard is erased!

Any Ideas what might be going on!

Thanks!

/emmc may not mount in TWRP, but that is ok.

I think you may have two different problems... unfortunately I don't own this model to do any testing on...

I really can't even attempt to determine what may be wrong with your internal recovery partition. I think the best way to address that issue would be to reflash the ROM...

It does sound like you might have a problem with your internal and / or external SD card...

You should be able to erase / reformat the internal SD card from the android system settings. That may help, especially considering the external SD card is mounted as a folder in the internal SD card...

You might also want to reformat your external SD card to FAT32 using a PC.

In regards to not being able to swipe the slider in TWRP... it is difficult to do on some of the models that I own... this is one of the reasons I did not previously release TWRP... I suspect this is why you can't swipe yours...

On some of the models I own, the slider and buttons in TWRP work perfectly...

On other models, I've found that the touch reactive point seems to be slightly above or below center of the graphic... once you figure out where it is, it easy to get used to.

For the slider, try placing your finger in the center of the circle, or halfway between the center and top, or halfway between the center and bottom of the circle... don't swipe, just touch it and hold your finger there and wait to see if it reacts... if it does, carefully slide straight to the right from that point...

That should enable you to flash, wipe, etc...

ShaunMT

[GJPete5580]

I assume you mean there seems to be a problem with the internal recovery partition?

What are you trying to backup? Everything? There probably isn't room on the internal SD card... have you tried changing the backup location to the external SD card?

ShaunMT

Hello! ShaunMT

As I mentioned in an earlier post that I have problems with the
TWRP Recovery on my Next7P12-8G Tablet. And I cannot boot into
the internal recovery. I think it may be corrupted or worse.
Cannot boot into the CWM recovery either.

TWRP reports that 'free space 0 MB' on the internal storage.

I also get the following errors:
E: unable to mount '/emmc'
E: updating partition details...
E: unable to mount internal storage
E: unable to mount /emmc during GUI startup
E: unable to mount '/emmc'

I try to backup to the external sdcard which TWRP
reports 2489 MB Free Space.

But, when I try to swipe to backup it will not
respond. It will not swipe it just wont respond
to my touch and swiping to the right.

When I boot into the system the internal storage
reports that there is 6.29 GB of free space.
And I can download and store files, video, etc.
However, if I try to boot into recovery the
data on the interal sdcard is erased!

Any Ideas what might be going on!

Thanks!

[shaunmt]

Hello!
The recovery partition on my Next7P12-8G seems to be corrupted
Is there a way to repair. TWRP reports that the internal sdcard has no
room left on it. I can't perform a backup.

Thanks

I assume you mean there seems to be a problem with the internal recovery partition?

What are you trying to backup? Everything? There probably isn't room on the internal SD card... have you tried changing the backup location to the external SD card?

ShaunMT

[GJPete5580]

recovery partiton

Hello!
The recovery partition on my Next7P12-8G seems to be corrupted
Is there a way to repair. TWRP reports that the internal sdcard has no
room left on it. I can't perform a backup.

Thanks

[shaunmt]

Agree on avoiding the cheap sd cards. Funny thing, I just bought 4 Samsung 16GB cards from Newegg 10 minutes ago at $6 each.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820147234

MoeFoh

That's not a bad deal... but I only buy class 10 cards...

I usually get mine from Amazon.

ShaunMT

[MoeFoh]

I would also try reformatting...

I've bad luck with cheaper SD cards... I know PNY isn't the worst... but I only buy Kingston, Sandisk, Sony or Samsung anymore... what you experienced is often a sign that the card is beginning to fail in my experience...

ShaunMT

Agree on avoiding the cheap sd cards. Funny thing, I just bought 4 Samsung 16GB cards from Newegg 10 minutes ago at $6 each.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820147234

MoeFoh

[shaunmt]

Well... Got it to work on my Samsung SD card, but not on the PNY SD card. Wonder why? For some reason it just doesn't want to pick up the file. No others similar files on the card. Tried deleting it then pasting it back on several different times, still no luck. If I didn't have so much other junk on there I would try reformatting it. The main thing is, it works! Thanks for the help.

I would also try reformatting...

I've bad luck with cheaper SD cards... I know PNY isn't the worst... but I only buy Kingston, Sandisk, Sony or Samsung anymore... what you experienced is often a sign that the card is beginning to fail in my experience...

ShaunMT

[MoeFoh]

Next8HI8G - TWRP and Kyser Root Zip...

Rooted a friends Next8HI8G using TWRP and Kyser Root Zip file and went without hitch. Fastest root job I have ever done. Clean and quick, no PC required, no fussy ADB driver installation.

Plus, no superuser is installed by Kyser, meaning you can go to the Play Store and download your favorite version. I use the superuser by the guy that developed CWM (what a genius).

I once rooted an old tablet using a PC root program and it installed a CHINESE version of superuser.apk and left no way to uninstall from Settings/Apps. I had to manually remove the superuser app and install a good one.

ShaunMT's porting of TWRP is awesome!!! It really makes the Nextbook tablets more useful and more powerful. Thanks ShaunMT.

MoeFoh