Hello.
You need to get out of that build. Follow this guide for possible solutions → APIM Sync Settings Not Saving, VER_ERR08 Errors, Cannot Perform Master Reset or Upgrades/Updates (Solved)
If none of those work, we do not have anything else to recommend at the moment.
It’s also worth reading Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4 , since no navs system may requiere a little extra step due to storage constrains.
But first, you must ensure the rwdata partition is not full…