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If you want to run low-firmware homebrew, look for a PS4 already on 5.05 or 9.00. Downgrading from higher firmware is not possible via software alone. ps4 tool downgrade v100 exe download patched
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that was installed on your specific console's backup slot. For example, if you updated from 11.00 to 12.02, you might be able to revert to 11.00, but not to an older version like 9.00 unless you have specific prior backups. ConsoleMods Wiki How to "downgrade" a PS4: full tutorial by Modded Warfare including troubleshooting advice