I have a problem to start in recovery mode, which means I can't flash roms and even re-root my tablets.
The major changes I did should be:
1. I un-root to firmware(not likely i guess)
2. I delete all the files in my tablet by connecting to a computer and select all items and press delete( perhaps I accidentally delete something that is important)
Now once I press power on/off with Vol down I can still access to 3 icons
I press Vol up to RCK then I saw Android died with the "!"
do anyone of you know how can I fix it?