I own a PSP 2003 model & it's currently on 5.50 GEN-D3 Prometheus-4
It's been quite a long time since I've messed 'round with PSP custom firmwares, psp hacking & whatnot.. And, I've noticed new custom firmwares being released like 6.20 & 6.35 so, I just need to know if I'm able to update to a...