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Ensure you do not overwrite existing critical files in that folder during transfer. Finalize Setup:

If you see this even after transferring the file, delete the ux0:app/PSPEMUCFW/flash0/ folder and try again. Failed Installation: download 661.pbp

If you need to manually install the file, follow these steps: Download the Firmware: Ensure you do not overwrite existing critical files

If your PS Vita is connected to the internet, Adrenaline can typically download this file automatically when you first open the app and press Manual Download: download 661.pbp