GEN-b2 to M55-6
ummm, what are you talking about?? i've never heard of m55-6 on a psp, ever!! lmao...
maybe you mean 5.00m33-6??? possibly?? hhhmmm..........lol
if that's what you do mean, since you're on 5.50gen-B2, use hellcats recovery flasher and it will fully install 5.00m33-6 in 2 mins time.
the link is in my sig. along with the 500.pbp file you'll need...
download the hellcats, extract it...don't worry about all the other files from it, you're only concerned about the "RECOVERY" folder from the extract.
place the 500.pbp file into the "RECOVERY" folder
place the "RECOVERY" folder into you psp's "GAME" folder
then run it like any other game...
select the target firmware as 5.00
then select to install the m33 version of the selected firmware...also select to restore all defaults for best results of installation.
edit...only if that's what you meant to install...good luck | 
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