I have an A200 with root and unlocked bootloader, after trying to flash Cyanogen, I was stuck at the boot screen. Tried to restore my nandroid backup only to have MD5 mismatch. After trying a bunch of tricks (vol+ turn on, lock off and on), factory reset, etc. I have finally ended up with "Magic value mismatch" no matter how I try to boot my tab.
I don't mind restoring to factory defaults, or getting my nandroid backup working, etc. Just want to get it functional again.