-Extract the zip folder "recoverycwma100" ( It's a recovery into Acer a200 simple tool )
-Copy ''recovery.img'' into your external sd card
-open a terminal emulator to your A100 ( root acces !!! )
- Write the following commands :
dd if = / mnt / external_sd / recovery.img of = / dev/block/mmcblk0p1
-wait a message '' xxxx bytes transferred in... ''
-open root explorer with a mount system
-rename the file '' install-recovery.sh'' into /etc/ it '' install-recovery.bak''
Reboot into recovery with volum down + power , and Enjoy