This error basically happens when you try to update PS4 system software with a corrupted/damaged update file, and fixing that is usually easy, unless you have a rare serious issue with the PS4 USB connection performance. There are several reasons why PS4 Error (CE-34788-0) would take place. This post is basically for this type of users who desperately try to find an efficient solution for this problem. Others were unsuccessful at all, no matter how many times they re-downloaded the PS4 system software update file. Some users could easily fix PS4 Error by just re-downloading the appropriate file update and properly storing it on the corresponding USB storage device. The error message states that the update file is not valid and it recommends trying again. A large variety of PS4 users reported that they encountered Error when trying to update the PS4 system software.
