yashsingh1/xdaforums huggingface dataset:
[Acer Iconia Tab A100] brendan802:
Funny thing is even on the acer loading screen I can still access adb with stock recovery. I have been trying to get fastboot update update.zip to work with no success. I have rewritten all partitons I can through fastboot with no luck. I think the partiton tables need to be rewritten through adb somehow or through apx mode but the cpuid is no longer attainable
[Acer Iconia Tab A100] pio_masaki:
CPUID doesn't matter for our devices, the SBK isn't valid for A100s.

Fastboot doesn't rewrite partitions, just dumps the information to the partition, if the partition fails to mount, it can't do anything with it anyways.

Thanks for letting me know stock recovery allows ADB, I wasn't aware of that. I'm going to try talking to morfic and faux about using parted to manually partition the device, hopefully it means we can rebuild the partitions completely, and get the system to mount then correctly, then we can start on what caused it.
[Acer Iconia Tab A100] waydownsouth:
Misinformation,

I was talking about the G2 (Desire Z/Vision) & it was a problem also affecting the MT4G/DHD & others.

There was no solution
[Acer Iconia Tab A100] pio_masaki:
Ah I apologise I thought you were talking about the A500, my bad. I'll edit that to be little more accurate. However I have read about partitioning around the corruption on the A500 with NVFlash, so I know thats possible. Well, given almost ideal circumstances it is.
[Acer Iconia Tab A100] pio_masaki:
As you seem to have a working ADB, would it be possible for you to boot to recovery, and using adb do this:

adb shell cat /proc/partitions

then copy it out and paste it in a post, then

adb shell cat /proc/cmdline

also copied into a post here

It can then be compared to a working device (mine) and see if anything is different.

For anyone on the stock bootloader, please do the same commands and report them back. It seems we used the A200 bootloader, which may be leading to this, or at least why the SBK fails. Also for any reponses, please include the recovery and if your bootloader was unlocked.
[Acer Iconia Tab A100] brendan802:
No thanks for all of your knowledge and support. I am giving this tab 1 more day and if I cant restore its going back to acer. I still dont understand how the recovery started actually showing the blue progress bar on the bottom instead of an immediate red triangle. I sent the wrong command with the wrong image I think something similar to this "fastboot flash ext4 mmcblk0p4.img" or mmcblk0p5.img and of course it errored due to size mismatch but then I was able to start to flash update.zip through recovery. Still baffles me

---------- Post added at 09:55 PM ---------- Previous post was at 09:50 PM ----------

Here is my output:

C:\android-sdk\platform-tools>adb shell cat /proc/partitions

- exec '/system/bin/sh' failed: No such file or directory (2) -

C:\android-sdk\platform-tools>adb devices

adb server is out of date. killing...

* daemon started successfully *

List of devices attached

0123456789ABCDEF device

C:\android-sdk\platform-tools>adb shell cat /proc/partitions

adb server is out of date. killing...

* daemon started successfully *

- exec '/system/bin/sh' failed: No such file or directory (2) -

C:\android-sdk\platform-tools>

C:\android-sdk\platform-tools>adb shell cat /proc/cmdline

- exec '/system/bin/sh' failed: No such file or directory (2) -

C:\android-sdk\platform-tools>adb devices

adb server is out of date. killing...

* daemon started successfully *

List of devices attached

0123456789ABCDEF device

C:\android-sdk\platform-tools>
[Acer Iconia Tab A100] pio_masaki:
Odd, this is the exact same issue I just ran into. I actually kinda bricked my device earlier today, but besides that, I was testing a Jellybean build, and it was giving these exact same errors. Basically, you have no /system, or rather, nothing there. That would certainly explain why there is no booting.

This was done in bootloader, or in recovery? If this wasn't in recovery, please try there. The other option we can try is I'll upload my system.img, which IIRC has CM9, but its a full partition image, 1.2GB. Since you seem to have access to fastboot, you can do a fastboot flash system system.img and see what it does. If it still can't work, I guess you can see if DD will work in recovery, but it would need external sd to be mountable.

Also, that CPUID is interesting. As in, that isn't close to right lol
[Acer Iconia Tab A100] brendan802:
Ive already flashed a full system backup from a working a100 with no luck in fastboot. Recovery gives nothing but mount errors. I guess I need to find a way to replace the unlocked bootloader with the original locked one and send it to acer. I do appreciate your help though.
[Acer Iconia Tab A100] pio_masaki:
I think dd a full partition in adb would give better results then a data only flash but its just a theory. Thanks for taking the time to test some stuff out for us

Tapatalked from my Galaxy S II.
[Acer Iconia Tab A100] LeRx79:
Bootloader v.0.03.06-ICS

TWRP Recovery

This is my output:

C:\android-tools>adb shell

~ # cat proc/partitions

cat proc/partitions

major minor #blocks name

~ # cat proc/cmdline

cat proc/cmdline

tegraid=20.1.4.0.0 mem=1024M@0M vmalloc=256M video=tegrafb tegra_fbmem=4919296@0

x3db3d000 console=none usbcore.old_scheme_first=1 lp0_vec=8192@0x3db25000 brand=

acer tegraboot=sdmmc gpt

~ #

I have access to fastboot too. But I tried everything I found on the forum without good results :crying:
[Acer Iconia Tab A100] pio_masaki:
This is a little scary, yet exactly what I was expecting. There is no partition table, at all. Unless you happened to not paste the output of cat /proc/partitions.

The other thing I noticed, in cat /proc/cmdline, there is no bootloader listed. Also, no CPUID, which is alot bootloader related. So, this explains why SBK fails, partially I think due to us using A200 bootloaders, and partially because if the bootloader is fubar, it won't pass anyways.

So we're left with either the EMMC corrupted or failed, and took the partitions with it, or its a bootloader issue, as it doesn't show up. Of course, its entirely possible the bootloader partition is also lost, which means it can't boot past the initial boot stage, the acer screen. Also explains why nothing can be mounted, but it strikes me as a little odd that recovery DOES work, but also doesn't show up in the partition list, even while IN recovery. I mean recovery runs from RAM, but it loaded from somewhere, right?

Only other option I can suggest, at least for you, LeRx79, is to flash the bootloader blob again. Fastboot will dump whatever to where ever you point it to, but doesn't mean it can actually flash it, if the partition is missing, or invalid, then it can't write to that partition, it doesn't exist.

If you still have the tools from when you unlocked the bootloader, try this:

adb reboot bootloader

fastboot flash bootloader whateverblobfileyouused

And report back if it fails, or does it, and actually attempts to boot again, and please do

adb reboot recovery

adb shell

adb cat /proc/partitions

adb cat /proc/cmdline

and see if they change.
[Acer Iconia Tab A100] LeRx79:
I've got an error when I try to flash the bootloader:

FAILED <remote: <00030003>>
[Acer Iconia Tab A100] pio_masaki:
OK then I suppose its gone too.

Try uhm...

Adb shell

Mount /data

See what it says probably not found but report it back here.

Then try

Parted /dev/block/mmcblk0p8 print

This should return partition info for /data including internal SD. Try for device mmcblk0p1 - mmcblk0p8 and paste what it says.

Its really looking like emmc failure which means new motherboard time. Only other thing is trying to create partitions.

Tapatalked from my Galaxy S II.
[Acer Iconia Tab A100] Romman0:
It is possible to downgrade to HC if your on completely stock ICS. If your interested I can link to a known working HC update.zip.
[Acer Iconia Tab A100] illego:
Thanks Romman but HC will probably be on the tablet when it comes back from Acer. I will probably update ics/unlock bootloader/twrp etc. and take my chances with the emmc. If it lasts a year then I will be happy. 7" tablets are now cheap enough to almost be replaceable every couple of years.
[Acer Iconia Tab A100] hardslog:
I haven't read about anybody's EMMC being nuked on the latest CM10 from WDS? I just got this tablet, and didn't know about this issue until after I got it........
[Acer Iconia Tab A100] justjackyl:
Its what I'm running, along with godmachines twrp and kernel.

Both supposedly have measures in place to stop it.
[Acer Iconia Tab A100] Romman0:
I hope CM10 is different. Illego was running GM v2 kernel and TWRP 2.2.2.1, and still bricked the emmc.
[Acer Iconia Tab A100] pio_masaki:
It'll happen eventually. Its how many run it vs how many brick vs how many are on this forum vs how many report it. Not many out of thousands of units worldwide. You could say the same of my ROMs, no brick reports but that doesn't mean it won't happen. HC is the only "safe" alternative.

And the thing godmachine did, I tried to explain it to both him and this forum and got ignored, it won't prevent it.
[Acer Iconia Tab A100] justjackyl:
Can you hot link me to that explanation bychance?
[Acer Iconia Tab A100] pio_masaki:
No as usual it got buried under all the brick posts. With him it was in irc, kept it off the forums.
[Acer Iconia Tab A100] justjackyl:
Ooh, ok. Just curious.

Your full of so much information!
[Acer Iconia Tab A100] pio_masaki:
Yeah but for some reason everyone ignored me on the bricking stuff and believed godmachine instead /shrug.
[Acer Iconia Tab A100] justjackyl:
Well, I listen to you!
[Acer Iconia Tab A100] hardslog:
I listen to you too! LOL! Clearly Godmachine's features weren't fail proof as I did read of some people bricking with his kernel. I admire his efforts for trying though. Let's just hope that if I get a Brick, its before my warranty expires (refurb unit with a 1 year warranty. Not too shabby!)
[Acer Iconia Tab A100] pio_masaki:
At the time it was the only recourse we had, and I was pretty certain it wasn't the cause of it. At a minimum it does prevent that brick bug, just not our brick bug. That was for Samsung devices. Its general practice with kernel devs to disable that erase ability on most all devices. I took it out of my thrive oc kernels for ICS and JB even though we don't use the same emmc. Better safe then sorry kinda thing.

Tapatalked from my Nexus 7 - Kuroikaze AOSP
[Acer Iconia Tab A100] illego:
If you are on xda flashing bootloader, recoveries, and Roms on your device you should accept the possibility of your device bricking. Thats why there are disclaimer on everything.

I was hoping for a brick before my warranty runs out so I could not be happier actually. I was pretty confident that the kernel would not stop a bad emmc bricking.
[Acer Iconia Tab A100] Theonew:
The Brutal End

My A100 (CM10 build 09-02 with Godmachine v2.0 & TWRP 2.2.2.1) has finally bricked itself...or so I thought. Here's the story:

MC3 froze while loading online multiplayer. The tablet was unresponsive, forcing the use of the power button (1st catalyst). Once the tablet rebooted, it was immensely slow and jittery (1st symptom). I then rebooted it a few more times but still experienced the same issue (I knew where this was going)...

I booted into recovery and attempted a factory reset but it stayed on "verifying files...." (or something like that). Attempted a reboot (to Android) but it froze at the Acer screen. I then attempted to wipe each partition, but of course, I got the magic words assuring me its an emmc brick. Attempted flashing stuff - same result. But wait, there's more ;)...

I left the tab plugged in for 15 to 30 mins, then attempted stuff. I booted into recovery and saw that partitions were being mounted again :victory: (partial/temporary emmc brick?? :confused::confused::confused:) even though i couldn't boot up. Followed the steps to return to stock - success :victory::victory:..but wait...there's more :angel:. Now, when I boot the tab, it gets past the stock acer screen and makes it to the "android" screen, but that's about it. It bootloops forever more. The good thing is I have access to adb at that point :cool:. I then rooted it from there (that was successsful, so partitions are still accessible), but unlocking the bootloader does not work, so I'm basically stuck from there.

Its still covered under warranty :victory:, but I don't really feel to send it back (may or may not ;)). Cheers :D.
[Acer Iconia Tab A100] justjackyl:
Dude...in warranty?

Send

That

****

Back!

Lol

G2x-temasek CM7 build135.4 w/faux 054 kernel
[Acer Iconia Tab A100] Theonew:
What was i thinking :silly::cyclops: lol. I just might will ;).
[Acer Iconia Tab A100] pio_masaki:
I have come across one of these semi or partial or temp whatever bricks, I'm really not sure what causes it, its not the same error as what we usually see with the gpt being damaged, or if it is, the supposed spare is intact and gets used. If that's the case, you may have survived the initial bricking by a few sectors and managed to get it to work through it on its own.

In my case both were verified corrupt and weren't recoverable.
[Acer Iconia Tab A100] tidewaterns:
:crying:

I tried to flash CM10 from TWRP recovery. Everything looked good but when I try to but it up it says boot verified failed. I also looked thru the previous post to see if any of that would but no luck because I cannot boot into TWRP recovery, adb does not find my device, and I can get anything to work using fastboot. Does this mean that my tablet is a total brick and that I need to send it to Acer or is there something I can try to see if I can get it working?
[Acer Iconia Tab A100] pio_masaki:
For whatever reason your boot loader locked. If its the stock a100 boot loader you're sol, if its the a200 then fastboot oem unlock will get you back to normal. What's the boot loader version when you start?
[Acer Iconia Tab A100] tidewaterns:
I used the unlock boot method here on the forums. Would that be the stock boot loader? It was unlocked. Also I have boot loader v0.3.13-ICS. I can get into fastboot mode but the device is not recognized.
[Acer Iconia Tab A100] pio_masaki:
The verified issue only comes up in a few cases:

Bootloader is a200 but locked

Boot loader is stock a100 and locked

Corruption or damage to the emmc.

I would try rebooting the tab and PC and see if fast boot comes up for the unlock command, or try another PC and cable if possible, if not try other ports and uninstall then reinstall the adb drivers, then reboot and try again.
[Acer Iconia Tab A100] tidewaterns:
what is the unlock command?
[Acer Iconia Tab A100] pio_masaki:
Few posts back, #200.

fastboot oem unlock
[Acer Iconia Tab A100] tidewaterns:
okay it says that it finished and the screen blinked. Is that all I need to do or is there something else I need to do? Also fastboot still does not list my device in there at all.
[Acer Iconia Tab A100] pio_masaki:
Did you get the screen that actually let's you unlock with the volume keys? Its the same as before with the script, just doing the command manually.
[Acer Iconia Tab A100] tidewaterns:
No I did not get that screen.
[Acer Iconia Tab A100] pio_masaki:
Then you aren't unlocked.
[Acer Iconia Tab A100] tidewaterns:
It was unlocked before this happened. Is there any thing else I can do to get the bootloader unlocked so I can get this tablet back to normal?

When I use the command fastboot devices it says ? fastboot.

Also when I try to apply an update.zip in fastboot I get

archive does not contain 'android-info.txt'

archive does not contain 'android-produce.txt'

error: update package has no android-info.txt or android-product.txt
[Acer Iconia Tab A100] pio_masaki:
Because you don't use an update.zip for recovery in fastboot....

You either need to unlock it again or send it to Acer. I've tried telling you that and offered things to help you along, try them.
[Acer Iconia Tab A100] Romman0:
The A200 boot loader that we run is 3.06 ICS. 3.13 is one of the stock unlockable a100 bootloaders. Something you did flashed the a100 boot loader.

Can you connect to PC while in the recovery? What happens if you boot to the recovery?

If you have the stock recovery back on, have you tried to flash the stock ICS .014 ROM?
[Acer Iconia Tab A100] pio_masaki:
http://xdaforums.com/showthread.php?p=30524194
[Acer Iconia Tab A100] Romman0:
Yup. The only saving grace would be if by chance it has the stock recovery on it, which I doubt, but it worth as look.
[Acer Iconia Tab A100] pio_masaki:
Or android boots, which if he's on the a100 boot loader it probably won't. If it does then we know what happened, and he can put the a200 boot loader back in.

Sent from my Thrive - Unified B4 - Balthesaur V2.71
[Acer Iconia Tab A100] tidewaterns:
I have tried the method listed on the forums to unlock the bootloader and all it says is waiting for device. I tried have using the commands listed before my post and still nothing. Looks like my only option is to send it back to acer. Thanks for all your help pio_masaki you are awesome!!

---------- Post added at 02:26 PM ---------- Previous post was at 02:18 PM ----------

How can I flash it if fastboot does not recognize my device and everytime I try to get to the stock recovery it says recovery verified failed?
[Acer Iconia Tab A100] Romman0:
You can't. I was just asking if you had the stock recovery on it, you could attempt to flash the stock ics. If it is coming up verified failed, it is mostlikely the case that the A100 bootloader got flashed over an unlocked tablet. Locking you out completely.
[Acer Iconia Tab A100] tidewaterns:
I had TWRP recovery on it before this happened. What is the process of getting acer to replace one in this condition? Will they know that I had it rooted and had the bootloader unlocked?
[Acer Iconia Tab A100] Romman0:
IMO, in your case, all they will see is your boot loader version which is OK. Chances are they will figure it is a faulty emmc and replaced the motherboard and reload the os.
[Acer Iconia Tab A100] tidewaterns:
Okay thanks!
[Acer Iconia Tab A100] quick_mcflurry:
Bootloop

Hello everyone,

i read most of the posts here but i'm lost about the solution to my problem...

Here it is : I unlocked the bootloader, rooted and installed the CM10 from Pio but since Trebuchet was crashing too much i decided to flash back the stock ROM with the update.zip method.

Now it's just stucked on the ANDROID letters logo.....

ADB wont show the device when i run the command :crying:

Plz help me on how to get back to the stock ROM plz ?

Thanks

..........and my computer wont recognize it, it stays as "unknown device"...
[Acer Iconia Tab A100] Romman0:
What bootloader wordage is showing up when you turn it on? Can you get into your custom recovery?

What did you do flash the stock ICS ROM in your custom recovery? If so, I don't see this as having a happy ending.
[Acer Iconia Tab A100] pio_masaki:
Me either luckily hes at the boot animation so he didn't wreck it by not reading the sticky addressing this exact method of flashing.

Adb won't work during boot on a stock ROM, plus you have to be in android to enable it.

Hard factory reset and pray. Also try booting recovery and hope it passes and allows you to use the update.zip if the reset fails. If stock recovery is unavailable, and reset fails you basically bricked it.
[Acer Iconia Tab A100] quick_mcflurry:
Reset

Thanks to both of you...

EDIT : found the Acer Hard Reset procedure and it works !!!!!!!!! BIG THANK YOU

I used the update.zip method to reinit.... so i just have the ACER white logo and then the android letters, and it stays on them.... it wont show any bootloader information or somewhat....

I tried to push on the hard reset hole with a pin : do i have to keep it pressed during many seconds or a click on it does make it ?

Thank you for your help
[Acer Iconia Tab A100] justjackyl:
Takes about 5s of holding it in.

G2x-CM7 Nightly 11/18/12 Build, Trinity ELP Kernel
[Acer Iconia Tab A100] aliensk:
another brick

i hope im posting in the right thread. my situation is the following. unlocked bootloader working fastboot and and adb but cant mount nothing in twrp even that i get get there without problems. any new solution? some way i can flash the partition table or flash the partitions one by one? i would be gratefull really becouse its out of waranty and in this country acer wont fix it (very disapointed of them) and if i cant fix it by myself the only thing left is the garbage bin :) i read most of the stuff on the thread and used the search option but still cant find the right answer. im comfortable to try everything and have modest knowledge how to flash stuff on android devices so any help will be huge thank you
[Acer Iconia Tab A100] pio_masaki:
Nope. Thus thread does nothing but verify a few things...

Acer used faulty parts. Parts known to the android community to randomly brick.

Acer will replace the board under warranty in most cases for free.

It doesn't occur on hc.

New board is required, there is no way to come back once it starts.

Without nvflash access we can't repair on our own, even if we did it may not be possible. Acer has to release the sbk in order for us to even try to fix this.
[Acer Iconia Tab A100] aliensk:
ok then. ill try to flash stock im just trying not to loose the unlocked bootloader in the process. flashed the stock recovery and now ill try to flash the custom rom just one question though. if i remove the bootloader blob from the update zip will i still keep the bootloader? maybe its risky but im already bricked so it doesnt hurt :)
[Acer Iconia Tab A100] pio_masaki:
If you're on stock recovery you can't remove the boot loader or the zip will fail the signature check. It has to be unaltered for stock to even look at it.

Otherwise yes it would keep the boot loader but the flash will fail unless you remove the line for it from the updater script.
[Acer Iconia Tab A100] Ajtaji:
Mine bricked in July on stock ICS while playing sentinel 3. Sent it to Acer not knowing a had a full year warranty. Got it back 1 week later with a new motherboard. Does this bug still exist on the new board? My warranties expire in December.
[Acer Iconia Tab A100] pio_masaki:
There is no new board, its the same as before. Mine even came back on hc.

Sent from my Thrive - Unified B5 - Balthesaur 2.71a
[Acer Iconia Tab A100] aliensk:
yea tryed and your right. ill try your suggestion just to see the results. is there any info how to repartition the partition table on this device? i know the htc desire can be partitioned if u flash another partition table and i found that the sgs2 can fix the emmc brickbug by repartitioning and isolating the bad memomory from the emmc device. sorry for my bad english
[Acer Iconia Tab A100] pio_masaki:
Read through the thread, in particular what I did when mine bricked. Also read the last line I posted in #226, there is no way to partition without nvflash which needs the sbk to be use. Thank Acer for being dicks and encrypting the board and making it impossible to attempt to repair on our own.

We can't get low level enough to partition nor restore the gpt, things I already tried. Feel free however, there may be more information regarding this since mine went.

I still wouldn't mind a bricked device to play with, though. I didn't have much chance when mine went as I had to get it back up and running to finish cm10 lol

Sent from my Thrive - Unified B5 - Balthesaur 2.71a
[Acer Iconia Tab A100] aliensk:
feel free to sugest what to try and i will it doesnt matter the risk :) i tried adb pull /emmc/. emmc with no succes maybe it will work on unbricked one but probably no your right i dont know but i allways say i wont buy acer anymore and buy anyway :) the make gr8 products do work but allways have littel devills inside and i really cant understand why they close so much theyr products. i also have an acer laptop only with 2 3 options in the bios :) sorry for the spam ill continue to research and read i guess have to learn a lot :)