JSPI1 on the A790X-G45 motherboard refers to a specific jumper or pin header used for BIOS recovery or programming. It typically allows users to access the BIOS chip directly for tasks such as flashing a new BIOS version or recovering from a corrupted BIOS. The exact function and configuration can vary, so it's important to consult the motherboard's manual for specific instructions on how to use JSPI1.