If you ever tried to downgrade your a500 to root it and a red message saying BOOT VERIFIED FAILED and a500 will not boot just follow these instructions and your a500 will be working again.
1. Download update.zip ( do not extract )
2. Insert SD Card into pc and place file on SD
3. Remove and place in a500
4. Hold power and volume down button, you should see
5. You should see updating then it will reboot and you are done (do not turn off if takes long in process)
WARNING:
THIS WILL ERASE ALL USER DATA IT WILL BE AS IT WAS WHEN YOU FIRST BOUGHT IT
LINK:
http://dc491.4shared.com/download/ZNH...