[Acer Iconia Tab A100] uminded:
This is another howto on upgrading your A100 from Android 4.0 (ICS) to the latest and greatest Android 4.1 (JB). I am posting this because I had a heck of a time getting it on my tablet because the /system/ refused to mount as RW and I received a dead droid logo. Also I did not find an all in one for n00b's.

Hopefully this helps some people out!

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Acer Iconia A100 - Custom ROM Walkthrough

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Root Method One: http://xdaforums.com/showthread.php?t=1531646

Root Method Two: http://xdaforums.com/showthread.php?t=1886460

Unlock The Bootloader: http://xdaforums.com/showthread.php?t=1557445

Install CWM 5.5.0.4: http://xdaforums.com/showthread.php?t=1601663&highlight=cwm

CyanogenMod 10 Jelybean: http://xdaforums.com/showthread.php?p=29276033&highlight=gapps#post29276033

Jelybean Overclocked Kernel: http://xdaforums.com/showthread.php?t=1818924

IMPORTANT!

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Before you can do anything below you need to be running ICS and have a rooted device! I received ICS in an over the air update and used THIS root method.

Preliminary:

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- Your running ICS and root right?

- Download the zip at the end of this post for all the files you will need (Windows Only)

- If you do not have the a100 drivers installed yet open "Acer_ADB_Drivers" and run "setup.exe"

- Open the command prompt with admin rights and goto your unzipped folder

Bootloader:

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- Run "install-eng.bat" and wait a while. If it looks stuck WAIT, fight the urge to push any buttons!

- A screen will appear with a lock and a door. Press the volume down (Left) key then volume up (Right) to select it

- At the command propmpt type "fastboot reboot-bootloader"

- The Tab will reboot at you will see in the top left "Bootloader v0.03.06-ICS(UnlockMode)"

NOTE: The Acer logo on boot gets a bit funky but its nothing to worry about.

ClockWork Recovery:

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- Enter "adb devices" to make sure ADB still can communicate. If not restart the Tab and make sure the USB is still plugged in.

- Enter "adb reboot bootloader" The tab will stay on the "Bootloader v0.03.06-ICS(UnlockMode)" screen

- Once bootloader is in fastboot type "fastboot erase recovery"

- Enter "fastboot flash recovery recovery.img" and it will write in a few seconds

- Enter "fastboot reboot"

- After the tab is back in ICS open the SDCARD drive in windows and drop the "cm-10-20120902-UNOFFICIAL-a100.zip" and "ICS A100 gapps.zip" files to the root of the SDCARD, not the internal

- Now you can shut off the Tab

Boot Into CWM:

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Hold the "Power" button and the "Volume Down (Left)" buttons for a few seconds and the Tab will start into CWM. If you get the dead droid logo then goto the section at the bottom!

Install A ROM:

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- Select "Backup and restore" and do a backup! if you skip this you will have nothing to go back to if it fails...

- Next do a factory reset and wipe the cache

- Select "Install ZIP from SDCARD" and choose "Select ZIP from Internal SDCARD"

- Choose "cm-10-20120902-UNOFFICIAL-a100.zip"

- Choose "Go Back" and then "Install" again

- Select "ICS A100 gapps.zip" this time

Congrats! You now have Jellybean with all the google apps!

Overclocked Kernel:

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Goto the link provided at the top and read all about this kernel as it has A LOT of features and options. Below is my quick setup.

- Off the forum thread choose a Zram if you want to use it.

- Plug your tab into the USB port and transfer the "gm-a100-v2.0-signed.zip" and whatever Zram zip you downloaded into the SDCARD drive.

- Reboot into CWM

- Do a factory reset and wipe the cache

- Choose "Install" and select "gm-a100-v2.0-signed.zip" to install the new kernel

- Go back and choose install again and select the Zram zip file if your using it

- Thats all you need to do. Just restart and Jellybean will be running the new kernel.

NOTE: After installing the new kernel I got a Quadrent score of 2563 which is better then the A500 and Galaxy Tab 10" so I am now quite happy with this device. One thing to mention is if you have used JB on something like the NExus 7 the UI is not the same on the a100. Other then the intro and the settings page the UI feels just like ICS but don't be discouraged as theirs a TON of new features in the settings tab I not can't live without!

Dead Droid Logo:

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This happened to me as my previous root worked at everything except my tab REFUSES to mount /system/ as RW! If the normal steps above would have worked this would all be avoidable...

- Start your tab and transfer "A100_Recovery.zip" to your "Internal Storage" drive

- In your file manager make sure "A100_Recovery.zip" is in "/mnt/sdcard/" and NOT "/mnt/external_sd/" and then unzip the contents to the current directory

- Download a terminal emulator from the Play store or open yours if you have one

- Run "su" to gain root permissions and accept any pop ups

- Run "sh /mnt/sdcard/rec.sh" and this will hammer CWM into your flash location

- Exit out of the terminal and shutdown your tab and go back to the Boot Into CWM section

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DOWNLOAD ------ (Dropbox)

DOWNLOAD---- (Sendspace)

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