Ensure your battery is at least at 78% (the updater will hard-block you if it is low).
Moderate. Bricking is reversible on PSP-1000 via Pandora battery, but assumed unavailable for this paper. psp 352 m33 upgrade to 660
: Ensure your PSP is charged to at least 78% (preferably 100%) and kept plugged into a power source during the entire process. Check for obstructions Ensure your battery is at least at 78%