WARNING - If it works on your device, be careful, as with an unlocked bootloader you can brick you tab faster than you can imagine.
0. It has been tested on the A100 ICS firmware. This bootloader doesn't work with HC firmware.
1. The tablet should be already rooted and charged more than on 30 %. Сonnect the tablet to the computer and power on.
2. Download this archive. Unpack it to any place.
3. Open the directory with the unpacked archive. Execute file:
for windows with the rights of administrator
Then you have to reboot, using, for example, this command:
sudo fastboot reboot-bootloader
"Bootloader v0.03.06-ICS(UnlockMode): Starting Fastboot USB download protocol"
For return original bootloader:
for Linux with the rights of root