Installing Custom Firmware on PSP 5.50 – cNxMB Won't Work

cNxMB is incompatible with firmware 5.50. It targets 5.03 and below. Attempting installation on 5.50 will likely brick your PSP.

Safe CFW Options for 5.50+

• PRO CFW (Pro-C2 / Pro-C Fix3): Stable, widely used, supports 6.20–6.61. Install via PROUPDATE from XMB.
• 6.61 Infinity (LME/ME): Permanent patch for 6.61 (latest OFW). Requires 6.61 OFW first, then Infinity installer.
• 6.60/6.61 LME / ME (Temporary): Fast recovery boot, no permanent flash write.

If You Just Want Homebrew/ISOs

• Pandora Battery + Magic Memory Stick: Creates service mode to install CFW on any hackable PSP (1000/2000 early). Not for 2000v3/3000/Go.
• Signed Homebrew (HEN): Runs on OFW without CFW, limited functionality.

Critical Steps

1. Identify your PSP model (1000, 2000, 3000, Go, Street) and motherboard (TA-088v3 = unhackable permanently).
2. Backup NAND (if hackable) via NAND Tool before any modification.
3. Follow a current (2023–2024) guide from wololo.net, PSP-Hacks, or r/PSP wiki.

Never downgrade from 5.50—high brick risk. Use a modern CFW built for your firmware.