"flash0" on PSP Is a NAND Partition, Not a File — Contains Core Firmware

"flash0" is not a file—it's the first partition of the PSP's internal NAND flash memory.

Breakdown

• flash0: Contains the core firmware (OS, system modules, fonts, resources). Read-only in normal operation.
• flash1: User settings, network config, savedata index.
• flash2, flash3: Additional system data (varies by model).

Accessing flash0 Contents

• VSH Menu / Recovery Menu (Custom Firmware): Mount flash0 as USB or browse via file manager (e.g., VitaShell on VHBL, PSP Filer).
• PC via USB: Only with CFW enabling "USB Device" → "flash0" mode.

⚠️ Warning

Modifying flash0 can permanently brick your PSP. Only edit if you fully understand the structure and have a NAND backup + Pandora battery / recovery method.

For homebrew/plugins, use ms0:/seplugins/ (Memory Stick) instead—safe and standard.