Imazing detail on why I cannot update my Ipad?

What does this mean and how can I fix please? I have done all the suggested reboots/re-downloads/out of beta program/wifi, imac routes etc to nill effect. The Apple way just keeps coming up Error 4000. So I have tried different leads, all okay, directly plugged into imac (running Big Sur). Last attempt with Imazing came up with this but I don't have a clue what it means.

Thank you in anticipation for any guidance on this you can give.

Domain=com.apple.MobileDevice.MobileRestore Code=4037 "Failed to commit stashbag" UserInfo=

{NSLocalizedDescription=Failed to commit stashbag, NSUnderlyingError=0x600007610030 {Error Domain=com.apple.MobileDevice.MobileRestore Code=4000 "Stashbag commit failed: NULL manifest - manifest is required on this device" UserInfo={NSLocalizedDescription=Stashbag commit failed: NULL manifest - manifest is required on this device}}}