i wana knw how much will cost for psp3.71 upgrade to 3.9 ?? thank

uhh... free?

Do It Yourself if u wanan save money

do it yourself zZzzz.., take less than 10 mins to search the internet for the firmware.

read some tutorial + videos on how to do it first so u'll get the overview of the process... then DIY la.. u'll get the experience..

i guess, u able to find the updates for free over Mr. Google...