Unbrick or fix NAND on the MK808

[l0ur3nz0]

[...]

P.S. mete essa merda a torrar...

LOL

Yes I could only flash - the first and only time - via recovery (NOT Mask Mode).

Believe me, if I haven't contacted the seller and he wasn't willing to trade it for another it would be burning right now!

I have done something similar to a optimus Black with a no service issue (but no go though)

But as they said they could send me a new one so I'm not messing with the hardware.

[estrika]

Just flashed once (1)!! But I must say the unit acted strangely before the flashing: first it didn't want to boot, had to use an different charger but afterwards the one that came was ok; then it was only detected by the pc in flash (or recovery) mode, now only in mask mode.

It may be the locked bootloader issue that finless bob says is affecting the clone units, which is strange 'cause I've bought it from an official (?) rep.

I haven't taken the heat sink off the SOC and the NAND is beneath it.

yes there are some mk808 clones with bootloader locked, but you are saying that unit acted strangely before you even flash right, the story of not booting and even only be detected in recovery was it stock flash right?
first flash you have done was in recovery mode or mask mode?
what i understand of your info is that you already had a problem before flashing, for me i would do a thermal fix, just in case, and after a stock firmware flash if possible, you risk nothing if well done, and you already removed the heat sink, so give some heat to soc nand and ram, let it cool, see if connections to usb port are well soldered, then test flashing, if no go, send it to supplier, or hardware flash the nand, this way you will know that nand is good or not.
send my the nand reference i will look the datasheet for more info.
normally even nands with bootloader locked can be unlocked, but needs hardware flash.

P.S. mete essa merda a torrar...

[l0ur3nz0]

Just flashed once (1)!! But I must say the unit acted strangely before the flashing: first it didn't want to boot, had to use an different charger but afterwards the one that came was ok; then it was only detected by the pc in flash (or recovery) mode, now only in mask mode.

It may be the locked bootloader issue that finless bob says is affecting the clone units, which is strange 'cause I've bought it from an official (?) rep.

I haven't taken the heat sink off the SOC and the NAND is beneath it.

[estrika]

I can only get it recognized in to mask mode. Then it refuses to flash: "IDB erase failed" sort of errors. It seems it's a communication issue or related. With rkflash (Linux) it read just 0s and spit errors.

As for reading/flashing the NAND with external prog, the setup would cost me more than it worths (I guess).

I don't want to risk damaging it if it is to be sent back. In fact, if I'd done something to damage it I wouldnt be comfortable sending it back.

Right now I can afford another month or so to get other unit.

how many flashs have you done before this error?
can you give your nand flash reference?

[l0ur3nz0]

I can only get it recognized in to mask mode. Then it refuses to flash: "IDB erase failed" sort of errors. It seems it's a communication issue or related. With rkflash (Linux) it read just 0s and spit errors.

As for reading/flashing the NAND with external prog, the setup would cost me more than it worths (I guess).

I don't want to risk damaging it if it is to be sent back. In fact, if I'd done something to damage it I wouldnt be comfortable sending it back.

Right now I can afford another month or so to get other unit.

[estrika]

lourenzo
wait is your problem, error flashing? or like diniz you can flash but black screen? if black screen i would do a thermal fix before sending it, if you know how to do it, you risk nothing, if it does not work them send it.
if your supplier do not accept the mk and you have error flashing, them take the nand out and flash it with some flash hardware.
like you said "RoHS mixed with poor fabrication", i have received many china electronics to repair, phones, tablets and stuff related, normally i repair with simple blind flash but i can tell you that many stuff only needs some heat to start working, this is a quality fabrication issue.

[l0ur3nz0]

To be on the safe side you should use a IR thermometer to monitor Temp and increase heat gradually. Also, you should heat both sides and isolate the areas to be treated from the heat sensitive components with some non conductive material.
One major issue these days is RoHS mixed with poor fabrication.

Pt: só não faço já isto porque é possível que me aceitem a devolução...
Alias, esta reparação já me tinha passado pela cabeça antes mas não com a pistola.

[estrika]

I've done this to 1 of my 2 xboxes. In the 2nd one had to undo the 1st rrod fix, to jtag it, and after that it would always rrod. The fix was accomplished with lots of flux beneath the GPU and an heatgun (with care ).

It might be an last resort option...

@estrika

which chip did you heatgun: SOC; NAND; or, both?

yes in last resort, when you have tried everything but no go, i reade a early post of someone that tried everything to flash it but couldn't and then it flashed, i believe the guy touched some broken connection and thats why he flashed good, in last resort try it, if done properly you risk anything, SOC, RAM and NAND, but you can do the rest too whit less heating time.

OFF TOPIC:regarding Xbox after a rrod repair you need to put more air flow or rrod will happen again

[esclusoilcane]

SANEI N83 - AMPE A85 RK3066 DUAL CORE semi fix

SANEI TABLET N83 DUAL CORE UNBRICK?


Thank you really much, using your guide i was able to put in mask rom mode this good tablet. Yeah the 8-9 pin gap wason the opposite side of your picture in my tablet

as you see my white pin is indicating it.
I was doing this because i updated the wrong firmware and after that the screen worked strange (i mean you touch a point, and another point on the opposite side responds).
Despite of having it in mask rome mode and restoring it the right firmware with rockchip batchtool or rkandroidtool, i was not able to solve my screen problem.
Why?
Someone has got issues?
THANKS

just some editing to your guide for my tablet and using rockchip batch tool
1) open your tablet: the screen down, use a faulty credit card or the plastic thing you use to play your guitar, put it on the edges and go around to hear many clicks, opening every side of your tablet
2) find the nand, it's on the left of the rockchip, if you put your tablet as i told you=upside down and with usb port on your right.
3) pin 1 is on the left. Count right to pins 8 & 9.
4) With a needle or a pin put the pin between pins 8 and 9 and hold it there. You are trying to short these 2 pins so make sure your actually on them. If you put it on other pins, nothing happens or simply it doesn't start.
5) Now plug in the USB cable to your PC to power on the unit.
6) If you are shorting the pins the PC should bong and the rkflash tool should say at the bottom "Found RKAndroid MaskRom Rock USB". If not, then your not shorting the pins properly OR you never had the drivers loaded to begin with. Otherwise if you use rockchip batch tool it will show a dark blue square. (you have not to touch any button, the square has not to be nor pink, nor green)
7) Good! If you have MASK ROM mode then now erase NAND (IDB). Let it finish. I open rktool and rockchip batch and i do this first anyway.
8) Flash the ROM. YOu must have the loader check box checked or it will complain and tell you a loader must be flashed (if you use rktool)

When I say screen acting strange, I mean that before doing all this things, I was trying some firmware from sanei, pipo, ampe, teclast (I'M SO SMART,DON'T YOU THINK?). So I pushed UPDATE in rockchip batch tool, but with the wrong firmware, and now after many tries still when you select show touches in developer options, you can easily see that if you touch a side of the screen, exactly the opposite side responds. It's like the UNLUCKY UPDATE BUTTON of ROCKCHIP BATCH has inverted someway the screen calibration!!
As I told you nothing worked, nor this long searched hardware method. But why!!??

[l0ur3nz0]

I've done this to 1 of my 2 xboxes. In the 2nd one had to undo the 1st rrod fix, to jtag it, and after that it would always rrod. The fix was accomplished with lots of flux beneath the GPU and an heatgun (with care ).

It might be an last resort option...

@estrika

which chip did you heatgun: SOC; NAND; or, both?

[estrika]

dinis
just my 5 cents.
apparently the nand is correctly flashed, info given by your logs. First thing i would do, read the nand to confirm if have value different from zeros.
some weeks ago i received one mk808 that had same kind of problem, flashed properly but always black screen, what i have done was using a thermal air gun in both chips circular movements for some seconds, like we do in xbox 360 to repair rrod, and surprise it started working, in my opinion some connection was poor or broke and the air gun resolved the problem, anyway it worked for me maybe can work with you.
(finless rom is amazing but is more cpu gpu demanding too, if the chips are badly solded the temperature can cause problems)

hope this help you

P.s. a minha pistola de ar quente tem varias temperaturas mas eu uso normalmente 350 graus pra nao ter de ter tanto cuidado com o tempo que fica a torrar

[fratello]

Wow ! I'm speechless ... You are a Great Man, Mr. Finless !

[Finless]

Finless, I would appreciate your help.
Can you send me your address ?
Thanks in advance.

Dinis Campos

PM sent.

Bob

[diniscampos]

If your willing to ship it to me and pay shipping back, I can try to fix it for you.

Bob

Finless, I would appreciate your help.
Can you send me your address ?
Thanks in advance.

Dinis Campos

[Finless]

If your willing to ship it to me and pay shipping back, I can try to fix it for you.

Bob