Sorry, you're stuck, the 3.51 update made the exploit in the Lumines downgrader not work, until a new downgrader comes out for a higher firmware, you won't be able todowngrade and play iso's.
PSP, all the way from 1.00 to 5.50 GEN D2 - DS Lite w/ M3DS Real (M3 Sakura v1.34)
PS3 3.01 - iPod Touch 2G 16GB Jailbroken - Xbox 360 60GB - PC, Q6600, 3GB DDR2, GTX260 (216) 896MB
on a side note, i think there wont be any successful downgrader and time sooner. (i rmb the time where there wasnt any downgrader for almost a year) so expect a wait of approxmimately 1 year i guess :/
Originally posted by tymmy202: can some personne ask me when i can downgrade the frimewarte 3.51 to 1.50 to after put 3.50 m33 and play download game tanks