Hi Acer experts, I had 2.1 then I updated to 2.2, everything seemed to be ok except that I had some problems with the mic. After that I tried to root it . downgrade it to 2.1 then the mic was working. I went one extra step to reinstall 2.2 again to check if the mic is ok this time, but I couldn't boot my phone at all (( Acer logo shows up for 3 seconds then black screen for-ever. Also I can't get into the recovery mode. Any hints !!!