SU (System or Software Update) Error Codes
The error code prefix SU represents all errors that are related to updating the PlayStation 4 system.
PlayStation 4 Error Code SU-35931-1
This PlayStation 4 error code means the system update data may be partially corrupted.
Once you start experiencing this error code, know that it could that your system software update is partially damaged due to network instability. To fix this error code, you should try restarting your PlayStation 4 system and try downloading the system update (Settings > System software update > Update from the Internet) again. If after trying this and you realize that the error has not been fixed then you’d have to contact PlayStation support for guidance.
PlayStation 4 Error Codes SU-30631-3, SU-30634-6, SU-30696-4, SU-30645-8
These PlayStation 4 error codes mean that there was an error updating system software.
If you’re experiencing this error code then it could mean that the update file you’re using may be corrupted. To fix this you will have to delete the update file from the USB device and clear your browser cache. After doing this try downloading the PUP file again and check if you can now update the system.
If you have tried using the USB drive and it’s not working then try a different USB drive or try updating it directly from the internet. To do this go to Settings, then System Software Update and then try updating again. Alternatively, if you’re trying to get your PlayStation 4 system with a USB drive, rather than using the USB drive you can try updating the console from the internet (Settings > System Software Update > Update via the Internet).
If you have tried all the other methods are nothing seems to work then it could be possible that there is a problem with your hard disk drive. Hence, if you recently changed your hard disk, consider reverting to the original hard disk drive and check if the error code has been cleared.
PlayStation 4 Error Code SU-30627-8
This PlayStation 4 error code means the system software may be corrupted.
In a bid to solve this problem you’d have to try updating your system in Safe Mode. If this doesn’t work out for you then you can also try reinstalling the system software using a USB device but this method will make you lose all your data if it hasn’t been backed up.