Unbrick or fix NAND on the MK808

[rdsok]

Thanks, this is my device: [ATTACH=CONFIG]4768[/ATTACH]

That is the outside of your device... not pics of the inside which is what someone trying to help you would need.

In fact... some of the instructions given earlier in this thread would have required you to open the device IF you had followed them... If you don't follow instructions/suggestions any better than that... you won't get the issue fixed.

[xuancanh]

You will need to look inside your device and see if it the same or not... If it isn't the same, get good pictures of the inside so someone can help you find a possible solution.

Thanks, this is my device:

[rdsok]

Help me,plz! Can I do this way for my Android mini PC: . My problem is showed here: http://www.freaktab.com/showthread.p...-Mini-Android)

You will need to look inside your device and see if it the same or not... If it isn't the same, get good pictures of the inside so someone can help you find a possible solution.

[xuancanh]

OK so on the ug802 there are pads you can short to erased NAND and put the unit into MASK ROM mode. You do this as the ug802 does not have a button to put you in flash mode. But also MASK ROM mode is a special mode unlike flash mode. It erases NAND like it was a brand new chip.

The MK808 has a reset button BUT it will only put it into ROCK Loader mode (flash mode). The only way to get it into MASK ROM mode it so short 2 NAND pins (like what the UG802 short pads do). I wish the MK808 had these pads to short but they do not.

Now you might ask "Bob, why would I want to put the unit in MASK ROM mode?". Good question!
If NAND gets corrupted or you flash another ROM with a loader not made for it, it can screw up NAND and from that point on you will get erased IDB problems, it wont flash properly and give errors, or a host of ROM flashing issues. The ONLY way to fix this is to put it into MASK ROM mode.

So because Freaktab user natxito is having this problem I figured I would help. I took my unit apart and pulled off the heatsink over the NAND memory chip. I had to do this so I could see where pin 1 was and what the chip part number is so I could look up the spec sheet.
NAND is H27UCG8T2ATR. I could not find this datasheet but this chip map is the same:

http://www.hynix.com/datasheet/pdf/flash/HY27(U_S)F(08_16)1G2M%20Series(Rev1.1).pdf

TECHNICAL: On most NAND chips by shorting pins RB and R/E together or in some cases RE and CE, it makes the processor boot up and think there is no NAND memory and puts it into MASK ROM MODE. It also "may" erase NAND.

OK so here is a text explaination of how to do it. Later I may do a video if I have time.

On the MK808 pry the cover off at the HDMI port. It helps to plug in a HDMI cable partially into the connector. Then use a screw driver to lift up the lid. The lid is the thinner of the 2 covers. Slowly pry around the edges of the case as you pull the snaps and remove the covers.
NOW be careful! There are 2 antenna's. One on each side of the case with short wires. So go easy and try not to damage the wires or antennas.

Once the have it apart the NAND chip is on the side of the board that DOES NOT have the USB etc connectors soldered to it. The chip is under the heatsink and the closest chip to the HDMI connector. If your holding the board with the HDMI connector at the top, pin one of this NAND chip is in the upper left corner of the board.

Now you can try to pry off the heatsink if you like. It is pretty easy as it is just taped on with heatsink tape. However if you screw up the tape doing so, you will have to go to an electronics store and by more. Clean off the old and install new tape. THIS IS NOT REGULAR TAPE! It has to be heatsink tape.

If you want to try this without removing the heatsink you still can do it.
1) Start up my ROM flash tool from my ROM kit. NOTE: you must already have the drivers installed etc or this WILL NOT WORK!
2) Hook up the USB cable to the OTG port of the MK808. Its the side port not the rear port.
3) Look between the heatsink and the board and you can see all the pins of the NAND chip. Again pin 1 is at the top. Count down 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.
5) No 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 flash 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.
7) Good! If you have MASK ROM mode then now erase NAND (IDB). Let it finish.
8) Flash the ROM. YOu must have the loader check box checked or it will complain and tell you a loader must be flashed.

Thats it! You should be unbricked and hopefully your ROM flash problems should be gone. If not, you can try to repeat the proceedure but if you still have issues, alas, you may have a failed NAND chip.

Bob

Help me,plz! Can I do this way for my Android mini PC: . My problem is showed here: http://www.freaktab.com/showthread.p...-Mini-Android)

[jboo]

IDB Erase not counting anything

Hello,

I've successfully gotten my MK802IV into MaskROM mode and have hit "erase IDB". The log reports that it starts, and then that if finishes. Usually when I go through this process there is counting involved and Bob has before said that if it doesn't count all the way up to 4096 then it didn't erase properly. Does anyone have any suggestions as to what I should try?

Thank you for your help,

Jboo

UPDATE: Counting didn't matter, I flashed it anyway and it's working.

All the best!

Jboo

[spammy]

This post saved my life. Thanks to all the smart guys that know enough about this product.

[lungomare]

For SDTNQGAMA-008G 5&6 pin on right side of chip are TF-BOOT Pins. I have it in my Nextbook NEXT7D12R with Amlogic AML 8726-mx.

[ATTACH=CONFIG]3068[/ATTACH]

Thanks for the big image.
But I have a different Nand Chip 29f32g08cbaca and I don't found the TF BOOT pin. Can I have a HELP?

[alterfritz]

NEO X5 bricked

Hi finless,

seems I bricked my NEO X5. I tried ALL. If I pay shipment (send / return) can you have a look?

Many thx!
alterfritz

[vasiboss]

Will an old PC work?

Dear all,

Thank u for your support,
I started before bricking it to put picuntu (it worked minus screen over scale and wifi didn't worked).
So i wanted to go back but flash mode didn't work (failed to read descriptor)
I tried to short pin, worked but after restart in flash mode the PC (laptop acer 5542 running windows 8.1) didn't recognize the MK808 (failed to read descriptor).

After that the device got sticked in flash mode every time, so no blue led, no linux / android.

I switched to me extra old PC (Dell optiplex GX 100 running win xp-> 400 mhz CPU and USB 1.1 (soooooo slow)).
After connecting the device and install the driver the device was recognized.
it is going to take me over 30 min to flash.

PS seems to be working... i will came back with the result.
PS It worked, well after writing the rom (usb1.1) got stuck at verifying it, but after disconnecting and letting the recovery reset works fine.

in conclusion start dusting off your old PCs

[sarrad]

Hello, I have MK808B original in which I tried to flash Finless ROM but it gave the Error: Download failed + ERROR: Run failed symptoms, after which I was unable to flash anything. So I entered the MaskRom mode and tried to flash the stock firmware with Rockchip Batch Tool, but it fails at the Prepare IDB phase. If I try with the Finless flash tool, the NAND erase is successful but flashing results in Error: Download IDB failed.
Does this mean that the NAND is fried and nothing can be done?

[bakahero]

I cannot for the life of me get the heatsink off. it's glue so hard and if i try to pry it off it feels like the board is going to snap. i tried to short the namd without taking off the heatsink and it just doesnt work.

edit: ya something gave up and i pulled the cpu out...

[tony763]

TF-BOOT Pins

I took away the heatsink and here is the chip info:
Line 1: SanDisk
Line 2: P224071991
Line 3: SDTNQGAMA-008G
Line 4: WAC5140066
Line 5: TAIWAN

For SDTNQGAMA-008G 5&6 pin on right side of chip are TF-BOOT Pins. I have it in my Nextbook NEXT7D12R with Amlogic AML 8726-mx.

[exglynco]

Finless, many thanks for your contributions to support our RK3066 devices. I got into a pickle by flashing a Finless ROM for the original MK808B on my V1 clone. It looked and ran OK, but I didn't have wi-fi, and after reflashing the wrong ROM, I got a defective memory message and had no NAND memory available.

I realized then I had a clone (doh!), and flashed the correct ROM, but my NAND was still defective. So I found this thread. It was harder than I thought it would be to short NAND pins 8&9 on my MK808B V1 clone. I succeeded after half a dozen tries, but got the "No Found 1th chip" and "Download IDB Failed" messages repeatedly when trying to flash your Finless 1.7 Rom for the V1 clone. I found an earlier message that said I should short the pins every time I go into Mask ROM to completely erase/format the NAND, and that fixed my problem.

So, thanks again. I'd have a $40 loss, if not for you selflessly sharing your knowledge.

[OldFart]

bizar

I have bizarre situation ,on screen of my laptop ( Dell inspiron 630m ) is no possible to see all window of rk flash tool . Only way to see command on the bottom ,is to rotate screen. Is it someone know what is the problem.
OK i am lamer but ....

[nipper]

Hi, My mk808b from Geekbuying seems to be on it's way out. I was browsing away and then the screen just froze, I reset it but the blue light wouldn't come on. I left it off for awhile, tested again, this time it booted but the screen went blank once I clicked on the browser. Multiple restarts have given different results, sometimes no blue light, other times stuck at finless boot screen or blank screen. So far I've tried a different power source but it had no effect. Managed, after multiple attemps, to restore a backup via CWM but no joy. What's my next step? Reflash via pc? Thanks