The process involves dumping and patching the console's internal chips to force the system to boot from the inactive firmware slot. : Disassemble the PS4 to access the motherboard.
If you never made a full dump of your console when it was on 9.00, you cannot create a 9.00 image from scratch. You would need a donor 9.00 backup from an identical console model (same region, same model number), which comes with its own risks (losing your console ID, getting banned from PSN). how to downgrade ps4 9.60 to 9.00
Safe Mode will refuse to install a lower firmware. The console will say, "The update file cannot be used (CE-34788-0)." This is a hard block. The process involves dumping and patching the console's
Would you like safe troubleshooting steps for a PS4 that’s having problems after an update? You would need a donor 9
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