yashsingh1/xdaforums huggingface dataset:
[Android General] Jovanz:
Hello people :) I have a (bit noobish) question. I own acer iconia A1-810, I updated it to kk because i wanted a newer os, and after the update i got a bit disappointed because what was super snappy tablet on jb, became full of little hiccups and slowdowns. So... How do i downgrade to jb?

Can i do it with stock recovery? I tried using official acer firmware but i couldnt flash it since new bootloader is not compatible with older firmware, so... What do i do? Any suggestions?

And i would like to know, has anybody else noticed some slowdowns since updating to kk?
[Android General] nikagl:
Welcome to this thread [MENTION=3810389]Jovanz[/MENTION] :). I would use the above mentioned instructions to flash an SPFT image of the JB ROM. The download for the JB ROM can be found in the first post and the instructions see this topic. As you can see above someone else was having problems flashing the ROM with those instructions, although in my case (on A1-811) it has always been fairly straight forward (as you can see from the instructions). Do not: you WILL need to reset to factory defaults.
[Android General] roymonie:
Hello, Pls I need an urgent help. I downloaded "Firmware stock recovery for acer Iconia A1-811 KK and installed using the sd card. The process completed but the device died when I rebooted it. Not even vibrating when the power key is pressed. What can I do to wake up the device? Thanks for the anticipated quick response.
[Android General] davidam091:
Link is dead, do you have it stored somewhere? Or is there another link?
[Android General] nikagl:
Here:

http://bit.ly/1M4AbXn

---------- Post added at 10:11 PM ---------- Previous post was at 09:50 PM ----------

Almost missed this one because of the other reply. I am not sure what could have happened. I would try to use the SPFT firmware, if you cannot get it to boot. Flashing SPFT requires you to download SPFT (see my post mentioned above a few times) and the SPFT firmware that is associated to A1-811. Did you try long press power to turn it off (it might seem off but is actually on)? Or drain battery and/or open tab to disconnect battery (warning: loss of warranty and you need to be carefull not to break the tab)?
[Android General] Tyfighter98:
So how exactly do I install the recovery installable zips for JB from Acer? Do I need to put CWM on my device first? If so, do I just install CWM like any other recovery via adb?
[Android General] nikagl:
If you don't know that, you haven't read enough about installing CWM onto Acer devices. First read some more, and then return to the topic. And no, installable zips from Acer you could try to install with the stock recovery. Big chance though it's reading what version you have on the device. In that case you'd have to hack the install script, remove the assert check in the script, but it back in the zip and run it from CWM... Installing it using SPFT is easier I guess :)
[Android General] Tyfighter98:
My apologies, so I just need to install CWM with SPFT and then I can flash the JB firmware I referenced earlier with CWM? For your reference I have an Acer Iconia A1-810 rooted on KK. I want to downgrade to JB. One last question as well, for the SPFT firmware do I select my current version (KK) or the one I would like to end up with (JB)
[Android General] nikagl:
I don't think anyone tried to downgrade yet, so you're on uncharted territory. Yes, you need to install CWM using SPFT (see several posts before I tried to explain how to do that several times before ;)). Then you need to try to install it using CWM (copy zip into sdcard and "install from sdcard"). When that generates an assert error, you need to open the zip and find the installer-script. That file needs to be edited by taking out the assert check that checks for a certain ROM, device or date (again: only if it generates an error). And because you then modified the file, you need to use CWM to flash it because a modified file is not signed anymore and the stock-recovery only allows signed files... :) (quick course in Android device modding :D)

Regards,

Nika.
[Android General] Tyfighter98:
Thanks you so much for the help! I might poke around and see what I can do.
[Android General] Tyfighter98:
When running SPFT, After I press write it appears to be constantly searching for the tablet? Am I missing something? It did say to keep the tablet turned off when plugging it in to the computer. Was I supposed to turn it on?
[Android General] nikagl:
Your method is ok. Try different cable, pc, usb port, etc.
[Android General] hotwheeler:
A3-A20 Unlock/Install/Flash???

I have a rooted by kingoroot Acer A3-A20 1.022.00_WW_GEN1 and want to install cyanogen mod 12.1 or 13 but can't get twrp or cw to work for me. Is there any other way besides recovery mode to install or a custom recovery of some sort? I have gapps-511-base-20150617-1-signed.zip - Google Drive and android_device_xiaomi_hm2014811-cm-12.1.zip but can't install. Can someone help me with this?
[Android General] Zocuo:
A3-10

I'm currently on image version Acer_AV0K0_A3-A10_RV04RC07_PA_CA (It's KK, 4.4.2) can I proceed with the rooting process or will I have to go to recovery and flash the base KK image?

And will userdata be erased?

Thank you in advance
[Android General] nikagl:
Root never removes userdata and usually you can flash it on any version. No specific experience on A3-A10 though. Make sure you have a full backup of your device before flashing anything. So either search for the stock rom on this forum, or make a backup yourself using SPFT.
[Android General] roskat:
I have an acer A1-811 that was stuck in boot loop. I have tried your method to unlock and now it won't even turn on.

Can you please help me?

Thank you
[Android General] nikagl:
Unlock won't change anything for bootloop. Only way to fix bootloop is by flashing a stock ROM:

http://xdaforums.com/showpost.php?p=62779402&postcount=809

What was the version of the ROM when you started all of this? What did you do exactly? Which files did you use for the process?

If it doesn't turn on, also when using SPFT with the above procedure, you can use one of these options:

1. Long press power (> 30 seconds!) and see whether it turns off and then press power again to see whether it now turns on

2. Wait a long long long time (>1 week) till battery drains

3. Remove the battery by removing cover (warning: warranty loss and hard procedure for opening cover)

Regards,

Nika.
[Android General] roskat:
Hey Nika, thank you for help.

Everytime I try to download the firmware using your tutorial I get this: postimg .org/image/gnhxl1yd3/

Before I made my first post I was following your tutorial from http://xdaforums.com/showpost.php?p=60137778&postcount=529

I did everything until I had to reboot in recovery mode. From that point the tablet hasn't been able to start.

I have removed the battery and try to download firmware without it. No success.

Please advise.
[Android General] nikagl:
What exact device do you have? Do you remember the ROM version? Specifically the SKU (= EMEA_GEN1 / TWN.GEN1 / WW_GEN1 / EMEA_FR, etc., etc.)
[Android General] roskat:
Acer Iconia A1-811

The tablet is from a friend and when he gave the tablet was stuck in bootloop so I don't know what ROM it had.

What is SKU?

---------- Post added at 12:52 PM ---------- Previous post was at 12:21 PM ----------

One more thing.

If I connect the tablet with battery I get: USB Device not recognized.

If I connect the tablet without battery the download starts but at 1% I get that error.
[Android General] nikagl:
SKU = EMEA_GEN1 / TWN.GEN1 / WW_GEN1 / EMEA_FR, etc., etc.

Not sure either what to do. Anyone else any suggestions?
[Android General] jomz878:
Hello, sorry im newbie bout android phones, What should i download and do to root my Acer Iconia A1-810 ( its kitkat ) i tried all one click root applications like kingoroot, kingroot, but failed, thanks :)
[Android General] jomz878:
#Update. I tried this guide. .http://xdaforums.com/showpost.php?p=63113649&postcount=825 and i bootloop. weee please help me Thank you in advance

#UPDATE #2 Solved. i used the secufoff "-A1-811-Unlock_SPFT_CWM_Carliv_A1-811" at this file given in the thread/link above. hehe. Thanks :) ( because secufoff wasn't even included hohoho )
[Android General] nikagl:
Thanks for updating us, well done. Should I change the post you mention so it's more clear what needs to be done?
[Android General] jomz878:
i guess so hehe, maybe add that secufoff (sec_ro) File

P.S My problem now is that rooting the device without losing it when rebooting (Jellybean). I'll try this?? since it has been redirected one of the post at page 83

http://xdaforums.com/showpost.php?p=60137778&postcount=529

Btw i tried using kingoroot. it works but lose root access when rebooting, tried framaroot ( half root only ), kingroot = failed
[Android General] sophiaannisa:
Hi Nika,

Thank you so much for your guide.

My Acer Iconia A1-811 was bootloop. When I tried to do the factory reset, it wasn't solved. It even stuck at logo--erasing (factory reset process)--back to the recovery mode automatically. When I clicked 'wipe data/factory reset' again, it would back to logo--erasing (factory reset process)--back to the recovery mode again.

So, i found this thread and tried to follow your guide 'Flash Full ROM'. Never unlocked/unbricking my tablet before. I am newbie at this thing.

When i tried to download (after did the write memory), it worked until yellow progress bar appeared. But, it always stuck at 42% with BROM ERROR S_DA_SDMMC_WRITE_FAILED (3149).

I had tried to download it without its battery, but still.. it was stuck at 42% with error 3149.

Now, I even can't turn on my tablet.

Do you have any suggestions?

Thanks!

Regards,

Annisa
[Android General] nikagl:
I am not sure what to change where. Which secuoff file should be added where? Both guides you mentioned ("Flash Full ROM guide (for unbricking) for A1-81x (A1-810 and A1-811)" and "Flash recovery and SUPERSU for ROOT for A1-811") have links which contain the secuoff file, don't they?

For root you need to install SuperSU from the recovery, see the last steps in the post you mentioned above.
[Android General] *Detection*:
Hey guys, I've been asked to try and fix an Acer Iconia B1-710 tablet

It was stuck on the Acer logo and wouldn't boot (Was working yesterday, but overnight it was left charging, something happened and it got stuck on the logo)

So I booted to recovery, and hit the factory reset option

It showed the "Formatting /data" screen, but hung and never completed

Now when I boot it up normally, or try to access recovery, it ends up back on the "Formatting /data" screen, and I can not get it to do anything else

PC doesn't see it at all either

Anyone got any ideas how to enter download/fastboot mode, or whatever it's called on these tablets, that allows firmware to be flashed from a PC ?

Does it have that mode?

Appreciate any help, thanks

EDIT - PC sees it for half a second each time I connect it while it is powered off, the USB connect sound plays, then disconnect sound plays, and it shows an uninstalled MT65xx Preloader device, which I've tried installing multiple drivers for, but nothing makes any difference, it connects and disconnects, or just loads into frozen recovery, and the PC can not see it from there
[Android General] ChaosHero:
Firediamond's guide was deleted. I want to root and install CWM on Acer A1-810. What should I do?

thanks
[Android General] nikagl:
Read some of the previous posts...

Verstuurd vanaf mijn S56 met Tapatalk
[Android General] ChaosHero:
Well, I do read the whole thread but it kinda confuse me since I'm on RV0HRC03_ww_Gen1, should I use Firediamond's method or I have to use toolkit and root from scratch then install CWM?

Sorry, I'm kinda noob
[Android General] nikagl:
Use this guide:

http://xdaforums.com/showpost.php?p=60137778&postcount=529
[Android General] Cayman.n2o:
Hey I just rooted my a1 810 following you guide.

I also flashed bloatware removal zip from first post, and since then my play store stoped working, just shows white screen and then closes.

I have tried to reinstall it, noting changes. Then I tried to do factory reset from Backup and reset menu and now I got rom with only few apps...

How can I flash stock rom again? Can I just flash zip from first post from cwm?

Update: I have flashed gapps and now I have a totally clean rom with only gapps :D Thanks to a bug!
[Android General] nikagl:
Yes, if you use the file "SDs_Acer_AV0K0_A1-810_RV0HRC03_WW_GEN1.zip" it should get your device back to stock. Beware, it will format your /data and other partitions.

See the script, it does a check but only for the product.model:

ui_print("Remove last update te_finish_update.txt...");
mount("ext4", "EMMC", "/dev/block/mmcblk0p4", "/cache");
delete("/cache/te_finish_update.txt");
getprop("ro.product.model") == "A1-810" || abort("This image is for \"A1-810\" MODEL, cannot update on your device! This device MODEL is \"" + getprop("ro.product.model") + "\".");
format("ext4", "EMMC", "/dev/block/mmcblk0p5", "-16384", "/data");
ui_print("Delete /cache/alu ...");
delete_recursive(/cache/alu);
show_progress(0.500000, 0);
format("ext4", "EMMC", "/dev/block/mmcblk0p6", "0", "/system");
mount("ext4", "EMMC", "/dev/block/mmcblk0p6", "/system");

If that does not work, you should also be able to restore it back to factory using this procedure (with SPFT):

http://xdaforums.com/showpost.php?p=62779402&postcount=809

[MENTION=4493088]Shreps[/MENTION], can you add this to the FP?
[Android General] peter6:
A3-A20 FHD Formatted

Hello,

Another question for my acer A3-20 FHD which is formatted. Perhaps someone with the same tablet (MFG Date 2015) can make a complete readback of his rom with MTK Droid Tool and an actual SPFT Version and after this, it's perhaps possible for me to flash the rom over the same Flash Tool.

Another way would be to readback only the boot.img and then after flashing doing a stock recovery with the actual stock file.

Please check my idea and let me know if this could work ?

Thx in advance for support,

Peter
[Android General] LeonReno:
B1-710 flashed

Hi,

I flashed successfully my rooted tablet B1-710 with SFPT firmware (archive B1-710 Firmware for flashing [4.1] from 1st page of this thread), I still get stock recovery.

- is this allow to unlock bootloader ? not see <unsecure>.img files in archive for boot,preloader like for other guide..

- can I flash with custom recovery/ROM now ?

Reading previous post still unclear as guide refer to removed files/links etc..

Thanks for your help.
[Android General] *Detection*:
Bump
[Android General] Shreps:
Flashing a SPFT Firmware to your device should bring it back to life :)
[Android General] *Detection*:
Thanks, so I've given this a shot quite a few times now, correct drivers installed (Even disabled driver signing on Win 8.1 Pro x64) - Drivers install fine, SPFT recognises the tablet for a second, then the USB disconnect sound plays, and I get these screens every time - any ideas what's wrong? :) Thanks

Tried different USB ports, and different USB cables too
[Android General] gr8techie:
HELP! My Acer Iconia A1-713 (16GB) is NOT flashing with SPFT

Guys, really appreciate if anyone can help me with restoring to stock/unbricking my Iconia A1-713 tab. I was fine till the morning when I got an update notification for a small (19MB) update. I applied it and then the tab rebooted to stock recovery and got stuck at the update process. So, I rebooted it and it was stuck at the first screen. Not booting anything.

So, I came across your guide and downloaded the drivers, SPFT, and firmware provided here.

I could flash the sec_ro file and then when as per instructions, I start flashing the full firmware using firmware upgrade, I get some BROM error. It may be 4003. I am not sure.

Can anyone help me plz??? I have my Windows 10 PC and drivers are already installed.

Thanks!
[Android General] nikagl:
Hmmm... Not sure which steps you took and which files you used? Can you be more specific please, a step by step instruction of what you did makes it easier to see what caused this. For instance, did you do the Write Memory step? And as you are on B1-710 (judging from the screenshot) did you use 0x1F88000 as Begin Address and 0x427100 as Container Length? I think you always need to write the secu_off img to be able to write to the device...

First of all, do you still have warranty on the device? In that case I would advice to go to the service center. If not, please also provide the steps you took to flash the device. Usually one or two steps are missed, like mentioned above. Not sure what steps are required for A1-713 to flash SPFT. I have not yet seen instructions for that device and don't have it myself to try...

I searched the thread and found the guide for A1-713:

http://xdaforums.com/showpost.php?p=59693904&postcount=480

Make sure to use the right SPFT and Firmware (flashing A1-713HD on A1-713 can brick your device and vice versa). Did you first flash SEC_RO? And did you try flashing with PRELOADER checked?

[MENTION=4493088]Shreps[/MENTION], can you add it to FP?
[Android General] *Detection*:
This is the problem, while not new at droid, I am new to this tablet and this recovery method

Basically I just followed this tutorial for using SPFT, installed drivers, added the scatter file to SPFT, and unchecked the Pre-Loader - hit download, plugged in the tablet while powered off, and got those error messages

I have no tutorial, or knowledge to follow to know how to do anything other than that atm

I did not even know about any write memory steps, or container lengths

If you could give me a pointer to, or a quick guide on how to do the above steps you mentioned, it would be very much appreciated thanks

It is a B1-710 yes

This is what I added to SPFT
[Android General] gr8techie:
Hi nikagl, thanks for responding. Yes, I do have warranty on the device and I am trying to approach a service center to send the device to Acer. Btw, I came up on the above guide for the A1-713 as linked by you above. I followed all the steps as per the guide. At first, I flashed the sec_ro and then I started flashing the full ROM. In the guide, it was mentioned that I need to flash the ROM with the preloader unchecked. So, when i unchecked the preloader, the download mode changed to Download Only instead of Firmware upgrade.

This is the only thing I guess which may have affected the flashing I feel. But it was recommended in the guide itself.

Please advise what to do. Actually I want to avoid visiting the service center. But if all else fails, I will go to them.

Thanks for your help.
[Android General] nikagl:
I don't have A1-713 so I can't speak from experience, only from what I see in the guide. The guide says it's recommended to uncheck the "PRELOADER" but when it seems that fails, you can try to make the process with this checked (only if it failed before while unchecked). So... did you try with checked and using Firmware Upgrade? It also says "and the firmware secro-sign.img is used instead of secro-sign.img from the previous folder". The previous folder is the "rework\secro-sign.img" file which should only be used with the Download Only mode for unlocking the device.

So... to summarize:

1. Open Flashtool

2. Select scatter from Rework-secro folder

3. Flash it with Download Only

4. Do NOT power on your device, it must be stay off

5. Select scatter from the main firmware folder

6. Deselect PRELOADER - it will switch to Download Only

7. Flash it with Download Only

8. If that fails repeat steps 4 to 7 with PRELOADER selected and Firmware Upgrade

And again: make sure your device is A1-713 and not A1-713HD :)

Regards,

nika.

---------- Post added at 04:20 PM ---------- Previous post was at 04:07 PM ----------

And that's the issue... that's for Acer Liquid S1 (a phone) and not for B1-710 (a tablet). The process is very different. It's more similar to what you can find in my A1-81x post:

http://xdaforums.com/showpost.php?p=62779402&postcount=809

But that too, is not correct for B1-710. I will change it slightly to make it B1-710 compatible, will be in the next post...

---------- Post added at 04:35 PM ---------- Previous post was at 04:20 PM ----------

(removed the guide so [MENTION=4493088]Shreps[/MENTION] can post it in the next post)
[Android General] *Detection*:
Thanks for the guide, unfortunately after following it to the letter, I can't even pass the 'Write memory' stage without getting this error

The tab is off, I connect it, the red bar quickly jumps along, then the USB disconnect sound plays and it shows this error

I've tried the troubleshooting tip of pressing reset 3 times too (Does it matter how long between each press?)

---------- Post added at 20:58 ---------- Previous post was at 20:40 ----------

EDIT - Just tried disconnecting the battery and trying again, same exact problem
[Android General] nikagl:
The error (2004) is mentioned in the troubleshooting section and the following is mentioned about it:

Fixing reconnecting:

When you connect your tab to PC, it recognizes tab. But after few seconds tab starts to reconnect every 3-5 seconds. Only two solutions are available at the moment:

1. Disconnect tab from PC, press Reset button (located in the small hole) THREE TIMES and try to flash again.

2. Try to flash without battery. Stuck on "Searching..." in SPFT: The problem is on PC side. Try to reinstall driver, use another USB port and cable. The most users who got this problem has solved it by using another PC. Try to Disable signature enforcement if you're on Windows 8 / 8.1

Stuck on Acer logo: Press "Reset" and turn tab on again.
[Android General] *Detection*:
Thanks, yea I edited my post, I tried that, along with removing the battery, still does the exact same thing

Gives a little hope, as this is a known error though, have people managed to unbrick this tab with the same problem?

It seems no matter what I do, all the tablet ever does is connect for a couple of seconds, and then disconnect, it does that twice, then shows the battery charging screen only

If I power it on normally without any USB connected, it's frozen on the recovery screen "Formatting /Data" and never does anything
[Android General] von_philippines:
good day..

any link please... Unlock bootloader + CWM for SPFT - my unit is Acer iconia B1 - A71
[Android General] rivaasjose:
Hello!!

the error that you have, I had it on my tablet b1 -710 you can see at page 80 of this post or (http://xdaforums.com/showpost.php?p=62687206&postcount=798) and no to come up with the solution ... I was told to make a testpoint (solder a point in one of the chip tablet) but never had answers ... and the guidelines for that time were eliminated staying with nothing.

as I never lost hope, I'll be back ...

I hope they can solve our problem ...
[Android General] LeonReno:
tips B1 710

Thanks to (re) post full guide for B1-710 :good::)

I did it and all went fine : just precise first boot take a while ~3-4 min..

I still got some questions :

Once done is it possible then to flash a custom recovery CWN with SPFT?

Is it needed to flash all again or only check <RECOVERY> under SPFT ?

For first reboot is it needed to boot in recovery mode ?

Then do you have some tips for custom ROM ?

Thanks again for your support