Originally Posted by enosrasun
if you put an 3.55 game on 4.00 firmware it will work because 4.00 contain the instruction for the game how to call and work properly
but if you put an 3.60+ game on lower firmware it won't work because the 3.55 don't have instruction for the game
my bet is that tb stick contain that instrucion ,they have modified firmware to use the stick and have the game call right
so insert the game ,and it will made the request to the ps3 firmware 3.55 don't know how to handle the game,and next it will use the drm stick for an set of instruction,(how to handle game request) and now if you have the proper library the game will run
the reason why 3.55 games work on 4.0 fw is because the eboot is signed with 3.55 keys are not blocked .
as for 3.60 fw games on a 3.55 the ps3 is able to read it as becuse of the per console key , but because the eboot says i want 3.60 fw so the ps3 gives the intrustions that it need to be on 3.60+ to do anythink with it . hope it makes a bit sence