You cant, there isn't any 2.0 firmware dumps. You can only test 1.0/1.5 (why would you wanna test 1.5?) because they're the only ones that have been managed to be dumped (that i could find anyways). I got 1.0 to boot, tried bootin something off ms and didnt work. Oh make sure you have your UMD
OUT of the PSP or itll boot that