Creo que este método no es el de blackthund3r, no? De ser así se podría añadir al primer post de este hilo para actualizarlo.
Yo mismo he usado esta herramienta y me ha ido de maravilla, además procura un par de cosillas mas como una herramienta root y la eliminación del nidus de Acer.
[ROOT] ICS Root for Iconia Tab A500/A501/G100W/A510/A511 by
blackthund3r
QUICK LINKS
Latest version of ICS Root for Windows: 7.0
Link:
http://adf.ly/8VRYr
Mirror:
http://adf.ly/8VSAY
Latest version of ICS Root for Linux: 1.1
Link:
http://adf.ly/72Ii6
Mirror:
http://adf.ly/72JEi
Latest leak of ICS: 1.031.00
Link:
http://adf.ly/6NhU2
Info
ICS Root is a tool to root Ice Cream Sandwich on Acer Tablets. It works on
all official ICS builds and is ridiculously easy to use. It is extendible via third party bundles too and is now less than 5mb in size and the zipped up download is just
1.8mb!!
Feature list
*Roots, installs Superuser, su, busybox and my A500 Root Tools app specific to the Acer ICS which allows you to remount /system rw without a patched kernel as well as
get your UID on the ICS Bootloader
*Can remove AcerNidus
*Can remove the auto-reflash of the stock recovery so you can install CWM in APX mode and not have it immediately overwritten
*Works with all A500 leaks as well as the OTA Releases on both the A50x and A51x!
*sysrw / sysro installation
*Bundle Market functionality like the APX Flash Tool but for automatic installation of files whilst rooting
*Completely rewritten from scratch in version 7 for reliability and functionality
Hope you find this useful

Let me know how it goes! It has been tested extensively on my A500 but I can't guarantee it'll be so perfect for you so I welcome all bug reports. Also, I take no responsibility for your equipment, although if something goes wrong I'd be more than happy to try and assist you!
I made a YouTube video demoing it. Sorry about the long-windedness
(yes the app does look different in that video. That video shows version 2 of ICS Root. We are now on version 7

)
Instructions
Windows
0) Install ICS on your tablet
1) Enable USB Debugging on your tablet (Settings | Development | Enable USB Debugging)
2) Plug your tablet into the computer using the USB cable
3) Load up ICS Root, choose your options and press "DO IT!"
4) Once rebooted, enjoy!!
Linux
0) Install ICS on your tablet
1) Enable USB Debugging on your tablet (Settings | Development | Enable USB Debugging)
2) Plug your tablet into the computer using the USB cable
3) Ensure you have extracted the Linux ICS Root zip file
4) Load up a terminal windows and cd to the directory containing ICS Root
5) Run
chmod +x ./root.sh to make the script executable
6) Run
./root.sh -d to debug the connection. Ensure ADB detects your device
7) Run
./root.sh -h to choose what options you want
8) Run
./root.sh <your options here> to process your tablet
9) Once the tablet reboots, you're all set! Enjoy!
System Requirements
Windows
* Windows XP / Vista / 7
* .Net framework 4
* Acer Iconia USB / ADB Driver from Acer
Linux
* Any good Linux distribution
* You MAY require, depending on your distribution and selection of packages installed, a udev rule. This is outside the scope of this post. Otherwise installing the android sdk may fix this
Both
* An Acer Iconia Tab A500 / A501 / G100W / A510 / A511 / A200 (probably) on stock Ice Cream Sandwich 4.0.3 from Acer (either leaked or OTA)
* The tablet USB cable
UnRoot
ICS UnRoot is an app I have written to REMOVE the ICS Root and all features installed by the application - effectively returning you to stock. This is useful if you get some sort of OTA notification which won't install etc
it is currently ***UNTESTED*** but should work - let me know how it goes!!

It will work up to ICS Root version 6 hacked devices and possible 7 too
Latest version: 1.0.0 (Initial Release)
Download
http://adf.ly/8RdE2
Mirror:
http://adf.ly/8Rdis
Fuentes:
http://forum.tegraowners.com/viewtopic.php?t=350
http://forum.xda-developers.com/show....php?t=1520469