add md5 verify thread
fix read file to buffer missing null char
toggle md5sum verification when installing zip files
formatting
simpler menu instructions
fix brokem fread
update 6.20.6 / libtouch_gui 1.04
nandroid: Disable nandroid reformat /system and /cache
extendedcommands: Add user selectable device format
Use ENABLE_BLACKHAWK_PATCH flag only, add it to p31xx and p51xx config