. This is not for the faint of heart and requires soldering skills. How it works:
The soldering points are microscopic. A single bridged connection, overheated pad, or corrupted memory dump will permanently destroy the motherboard.
If the system refuses to accept the USB drive or you are getting error codes like SU-41350-3 , check these specific troubleshooting points: downgrade ps4 903 to 900 fix
A PS4 cannot be downgraded via software because the console's Non-Volatile Flash Memory (sflash) and System Controller (Syscon) chip keep a strict record of your firmware history.
Ensure the download completed. If the file is corrupt or too small, the PS4 will refuse it. Clear the USB and re-download the file directly from PlayStation. A single bridged connection, overheated pad, or corrupted
Because the PlayStation 4 operating system is proprietary and encrypted, the concept of "downgrading" is widely misunderstood. There is no official, safe, or simple method for the average user to downgrade the system software from version 9.03 to 9.00.
If you haven't soldered before, you may permanently damage your console. If the file is corrupt or too small, the PS4 will refuse it
You need to find the Serial Flash Memory (NOR/NAND) chip and the Syscon chip.