Updated Sync 3.4, Build 22251 to 3.4.23188

Hi.

So you already reformatted the unit in the past, you can do it again unless the unit has been serviced or changed after that date.

That’s because .22251 has a bug where a partition gets full. You need to get out of that build. If your rwdata partition is full, you need to check this thread for guidance → APIM Sync Settings Not Saving, VER_ERR08 Errors, Cannot Perform Master Reset or Upgrades/Updates (Solved)

As long as you configure Syn3updater correctly it will provide the recommended USB.
In your case it should be a downgrade USB. If you want to know more about installation methods, you should read the documentation since it’s very well documented.