You cannot do this with just a USB stick. To downgrade from a higher firmware to 9.00, you must have:
The modified data is flashed back onto the chips. Once the lifted pin is safely reconnected or bridged with a custom hardware module, the console is reassembled and booted. If done correctly, the system boots into the previous firmware slot. Comparing Your Options: Reverting vs. Waiting
ИП Кузнецов Александр Александрович
ИНН 262706501623
ОГРН 320265100093673
