the analog stick broke on my 1.50

so i had to trade it in at the store (with my extended warrenty) and somewhat luckily got at least a 2.71 psp, but with a ta-082.
so i installed the HEN 'D' and now i'm trying to emulate 1.50 in the devhook for 2.71, but it won't reboot into 1.50. i want to do this so i can run the 3.01 dumper to emulate that instead of 2.71 with devhook 0.51 for hen D. i got a dump from another psp site, put it in the hd/150 folder, but it won't reboot. could someone help me out please by telling me what i'm doing wrong or putting a link up to the right guide. if not i guess i'll just emulate 2.71 on my 2.71 so i can play my backups.
thanks a lot.