Amlogic Next7P12-8G Modified Recovery - Stock Rom & Flashable Root

[Amirock13]

Nevermind. You were not supposed to rename it... or open it.

What is the error message that you recieve when you try to flash kyser_root.zip?

ShaunMT

The verification fails. what to do? i even tried renaming it to root.zip

[shaunmt]

The verification fails. what to do? i even tried renaming it to root.zip

Ok... If the the file verification is failing, then you have either tried to flash it in stock recovery, or your kyser_root.zip is damaged.

So... re-download kyser_root.zip. Do NOT open it. Just put the entire kyser_root.zip on your external SD Card.

Verify that uImage_recovery is on the SD card recovery, and not located inside a sub folder or .zip.

Reboot to recovery and try again.

ShaunMT

[GJPete5580]

Recovery Mod and Root works!

Thank You for this modification!

The Recovery Mod works fine.

The Root also works without any problems.

I did not flash the rom, because if it failed, there is no firmware to backup to.

Next book Tablet Next7P12G Premium SE, bought at Walmart.

I am looking forward to seeing some custom roms.


Thanks Again ! GJPete5580

[shaunmt]

Thank You for this modification!

The Recovery Mod works fine.

The Root also works without any problems.

I did not flash the rom, because if it failed, there is no firmware to backup to.

Next book Tablet Next7P12G Premium SE, bought at Walmart.

I am looking forward to seeing some custom roms.


Thanks Again ! GJPete5580

Thanks for reporting your success!

ShaunMT

[Amirock13]

stock recovery?#

Ok... If the the file verification is failing, then you have either tried to flash it in stock recovery, or your kyser_root.zip is damaged.

So... re-download kyser_root.zip. Do NOT open it. Just put the entire kyser_root.zip on your external SD Card.

Verify that uImage_recovery is on the SD card recovery, and not located inside a sub folder or .zip.

Reboot to recovery and try again.

ShaunMT

What do you mean when you ssy that i gave trird it in my stock recovery?

[GJPete5580]

Backup and Restore

Hello !

Question: I noticed that there is no Backup/Restore option with this Recovery Mod.

Am I missing something here, or did the Recovery Modification not work as I first thought?

I am somewhat new with Android Devices, so bare with me.

Also, is there a way of backing up the original firmware (ROM).

I know there is CWM and TWRP, but they are not available for the NextBook Next7P12-8G.

Can I use the Android-SDK Development Tools to do this ?


Thanks Again ! GJPete5580

[shaunmt]

What do you mean when you ssy that i gave trird it in my stock recovery?

The stock recovery and the modified recovery look exactly the same. The only difference is that stock verifies private nextbook signatures and modified verifies public google signatures.

If the signature verification fails for any of my files, you're either in the wrong recovery, or one of the files you downloaded is corrupted.

Redownload the modified recovery and the root package, verify that they are placed correctly on the external SD card (they won't work on the internal SD Card) and try to reboot to recovery and flash again.

ShaunMT

[shaunmt]

Hello !

Question: I noticed that there is no Backup/Restore option with this Recovery Mod.

Am I missing something here, or did the Recovery Modification not work as I first thought?

I am somewhat new with Android Devices, so bare with me.

Also, is there a way of backing up the original firmware (ROM).

I know there is CWM and TWRP, but they are not available for the NextBook Next7P12-8G.

Can I use the Android-SDK Development Tools to do this ?


Thanks Again ! GJPete5580

The modified recovery and stock recovery look exactly the same. The only difference is the modified recovery has had the signature verification key changed from the private nextbook key to the public google key. This recovery does not offer backup and restore functions.

The only way to do this currently is to dump the device partions using dd (romdump and onandroid do net get all of the partitions), then repackage them into an update.zip format with a handwritten updater-script, sign the package with google test keys and flash it with the modified recovery.

I've managed to port CWM and TWRP on my devices, but neither customer recovery support our UBIFS file systems. Eventually, I'll be releasing some modified ROMs that reformat our devices from UBIFS to EXT4, then we'll be able to use TWRP.

ShaunMT

[oldpapa49]

I have just finished doing the stock rom.. The trick is is to put the uImage in root of the SD card with the rom file as .zip

Insert the SD card, Hold Power and left volume button until the unit starts.

When it boots to the selections screen (install zip etc, ) go to install from SD card. Your .zip will be located there. move to it and press the power button.

It should install the rom..

The 2 files need to be on the sd card at the same time.
Not try to boot with the uImage then place the zip on after.. It did not work

Thought I point that out..

Thanks guys..

I have 2 HP Touchpads with CM10.1 on both.. Kindo of the same way of installing new rom

You might need to wipe cached, but since it is a complete replace, maybe not

[GJPete5580]

rom dump

Hello Again! ShaunMT

I used the program romdump to dump the stock rom and these are the results:

root@android:/ # /data/local/romdump
Android ROM dumper v0.82b
(c)2011 Sebastian404
Device : IMM76I.v005

Creating required files... done.
Opening mtd table... done.
Dumping kernel config... done.
Dumping boot partition... done.
Dumping recovery partition... done.
Dumping system partition... done.
Creating Checksums... done.
Cleaning up... done.
All done.


I also, from a terminal emulator ran 'cat proc/mtd' with these results:

root@android:/ # cat proc/mtd
dev: size erasesize name
mtd0: 01000000 00400000 "bootloader"
mtd1: 00800000 00400000 "logo"
mtd2: 00800000 00400000 "aml_logo"
mtd3: 00800000 00400000 "recovery"
mtd4: 00800000 00400000 "boot"
mtd5: 20000000 00400000 "system"
mtd6: 08000000 00400000 "cache"
mtd7: 20000000 00400000 "userdata"
mtd8: 1b4800000 00400000 "NFTL_Part"
root@android:/ #

You mentioned that romdump does not dump all of the partitions.
From the results you see what partitions are missing ?

I want to use dd to dump them, however I am still going to do some more research
as to how this is done ?

Also, research what is a handwritten updater-script, sign the package with google test keys is about ?

Any information or a link to where to find this info would be appreciated !

PS: I use Linux as my main operating system.

Thanks Again ! GJPete5580

[shaunmt]

Hello Again! ShaunMT

I used the program romdump to dump the stock rom and these are the results:

root@android:/ # /data/local/romdump
Android ROM dumper v0.82b
(c)2011 Sebastian404
Device : IMM76I.v005

Creating required files... done.
Opening mtd table... done.
Dumping kernel config... done.
Dumping boot partition... done.
Dumping recovery partition... done.
Dumping system partition... done.
Creating Checksums... done.
Cleaning up... done.
All done.


I also, from a terminal emulator ran 'cat proc/mtd' with these results:

root@android:/ # cat proc/mtd
dev: size erasesize name
mtd0: 01000000 00400000 "bootloader"
mtd1: 00800000 00400000 "logo"
mtd2: 00800000 00400000 "aml_logo"
mtd3: 00800000 00400000 "recovery"
mtd4: 00800000 00400000 "boot"
mtd5: 20000000 00400000 "system"
mtd6: 08000000 00400000 "cache"
mtd7: 20000000 00400000 "userdata"
mtd8: 1b4800000 00400000 "NFTL_Part"
root@android:/ #

You mentioned that romdump does not dump all of the partitions.
From the results you see what partitions are missing ?

I want to use dd to dump them, however I am still going to do some more research
as to how this is done ?

Also, research what is a handwritten updater-script, sign the package with google test keys is about ?

Any information or a link to where to find this info would be appreciated !

PS: I use Linux as my main operating system.

Thanks Again ! GJPete5580

Romdump only dumps boot, recovery and system. You need bootloader, logo and aml_logo also, in order to make a full ROM. You might want also want cache and userdata for a personal backup. I have no idea what the NFTL_part partition is for.

Do a google search concerning how to create an android update.zip to learn how to prepare, package and sign the files, including the META-INF folder and update-binary and updater-script that tell the recovery how to install it. We would normally copy and possibly modify these files from an official ROM, but since nextbook won't provide any ROM, I had to create my own. You can copy them out of my ROM, but I can't guarantee they will work without modification. The updater-script is written in EDIFY. Google EDIFY to learn more about the available commands.

Also note that, if anything goes wrong, you risk potentially bricking your tablet.

I hope to have a TWRP compatible ROM and recovery ready for our tablets in the near future. It will make it possible to do a normal backup / restore.

ShaunMT

[jac1599]

GREAT work! I had been following this forum for a while waiting for a good root to come out, but then my nextbook died about 6 weeks ago...and I mean dead...the recovery kept giving me failed to load signature error (even on the stock ROM straight from nextbook!!!) so I kinda lost track of the forum.

Anyway, I came here today to see if anyone else had the same problem and lo and behold, you have modified the recovery, posted the stock ROM, and provided a root function. Everything I needed!

It all worked flawlessy. The only problem I am having is that my battery display is stuck at 100%. Relatively minor annoyance.

Thank you so much for putting in the work on this!

Nextbook 7p12-8g
Serial: YFG03130XXXXX

[shaunmt]

GREAT work! I had been following this forum for a while waiting for a good root to come out, but then my nextbook died about 6 weeks ago...and I mean dead...the recovery kept giving me failed to load signature error (even on the stock ROM straight from nextbook!!!) so I kinda lost track of the forum.

Anyway, I came here today to see if anyone else had the same problem and lo and behold, you have modified the recovery, posted the stock ROM, and provided a root function. Everything I needed!

It all worked flawlessy. The only problem I am having is that my battery display is stuck at 100%. Relatively minor annoyance.

Thank you so much for putting in the work on this!

Nextbook 7p12-8g
Serial: YFG03130XXXXX

Thanks for the feedback and glad it helped you!

The stuck battery indicator is definitely something we don't usually see on the nextbooks. You might try wiping data and cache. If you had a bad flash, you might have to reboot to recovery, wipe everything from recovery, then reflash. If all else fails, you might check the play store for an app that can calibrate the battery.

ShaunMT

[jac1599]

Cool. I tried wiping cache and data and reflashed the stock rom you provided. Just left for dinner so I will update you on results later.


Sent from my iPhone using Tapatalk - now Free

[jac1599]

Thanks for the feedback and glad it helped you!

The stuck battery indicator is definitely something we don't usually see on the nextbooks. You might try wiping data and cache. If you had a bad flash, you might have to reboot to recovery, wipe everything from recovery, then reflash. If all else fails, you might check the play store for an app that can calibrate the battery.

ShaunMT

Well, the reflash worked. Battery level is now functional. Thanks again! Can't wait to see some custom ROMS!