It's always best to backup your microSD to a folder called Backup on your PC before upgrading to a new firmware version.

Then format your microSD with the Panasonic SD Formatter and use these options :
FORMAT TYPE - FULL (Erase ON)
FORMAT SIZE ADJUSTMENT - ON

Extract the files from new firmware and copy the following to your microSD :
TTMenu folder
TTMenu.dat

Copy usrcheat.dat to TTMenu folder

Then create a folder called Games on your microSD and put all your games and saves into that folder

