Based on my memory, you are the first one to describe that issue on .23188.
Try creating and running an interrogator log against the unit to determine if the RWDATA partition is full.
I will link you to the solution for that error but on other builds, 23188 is not affected by that bug, but it has the exact same symphtons as yours → APIM Sync Settings Not Saving, VER_ERR08 Errors, Cannot Perform Master Reset or Upgrades/Updates (Solved)