I recall someone doing it by rip/patch/return:
The arguments for & against are complex - without an EEPROM patch, at the moment, you cannot pass off a drive as a higher model (eg. in a system) - if a drive is CF firmwared, somone gets a nasty surprise if they apply an ordinary update.
However, with the abandonment of the 1213S at a very unsophisticated firmware, and the availability of at least one "transition" 1633S @ 1653S capability firmware (Sony, unless you count the pulled BS41 and the unreleased BS42), there is a reasonable case to say "I want MY drive to be...".
Do we save the "nuclear option" until they knock back firmware patching, that's the only real issue...