The PSP Go does not have a Recovery Mode (unlike PSP-1000/2000/3000 which access it via specific button combos on boot).
/r/PSP or wololo.net for rare unbrick methods (e.g., JTAG via test points).Always keep firmware updated (6.61) and avoid interrupting writes. CFW (PRO/LME) on PSP Go is temporary (FastRecovery needed each boot).