You may not have enough space.
Read this Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4
Also, since you are changing regions, you are trying to flash more things that an equivalent APIM would for US. DAB, for instance I think.
Check the tutorial to troubleshoot space issues.
Also read what has been said before about DAB.