Just a line to tell all you, that I give my tablet to my wife so right now I don't have it and I can't give you support 100%. I just loosing my sight and the effort to look at the tablet so close is making things worst, so I must refrain from using tablets from now. Thanks for all. Anyway I will stick around to read the forums.
Before downloading please read this warning:
This is a pure stock US GEN2 Rom with only su and Superuser added, if you have any problem with this ROM, you have the problem with Acer, not me. If you start to flash ROMs without knowledge and without knowing what you are doing, you can blame only on yourself, learn and read before flashing any ROM.
I have a family, so I don't work weekends at my work or HERE! I can't answer to each one when you want, this is not customer service, and I don't earn anything from this. Specially when some people don't read the instructions posted here, or their answers are easily found here. I'm not a boring teenager without any life beside being 24/7 here. So vent your frustration elsewhere.Thanks, and remember: Read, Read, and read before doing anything.
I just cooked a stock HC 3.2 Rom for the iconia a500 US version (GEN2) already rooted.
I only added su (linked to xbin) and Superuser. The rest remains exactly as the Acer Stock 3.2 US version Rom. You need to have the CWM recovery on your tablet to be able to flash it (Use the Acer Recovery Installer from the market).
Don't try to flash it using the acer stock flash method.
I have done the install in my tablet and it's working great. if you updated the Superuser app to the latest version (3) you will need to clean the data from settings after flashing this rom or else you will get a FC, that's because the Superuser rom version is lower than the one in the market. The same can happen with Maps and other updated ROM stock applications versions.
How I made it:
You can do it by yourself. Is very easy. Extract the 500 or 501 stock ROM and substitute the updater-script in the following path for my ROM script extracted from my rooted ROM:
Then add su to the following path folder (bin): \update\system\bin
and Superuser.apk to: \update\system\app folder.
The script will take care to properly link su to xbin and to flash everything with the correct permissions.
Don't forget to delete the bootloader.blob file from the main update folder. Compress everything and rename the archive as you wish. Flash with CWM.
You can download Superuser and su from the following place (creator):
By the way the same procedure can be use to root another country version ROMs like GEN1, EMEA or similar. So if you are not using an US device you can still modify your country's ROM to work rooted.