GlobalTop MiniMouseGPS MT3333 Overroll issue, upgrade fail

I have some GlobalTop MiniMouseGPS modules based on MT3333 (firmware ANX1.10 2028) with overroll problem.
I tried to upgrade (using Global Top Flash Tool V1.2.3, PC with XP or Win7) but it fails with error:

[Flash Download]
Fail!!(Download) DA responded with an incorrect sync character

Where is the problem, what can I do?