Catymag and lolypop000,

Thanks for your advise, Anyway I always keep press / hold on top left of screen after enter in pre-boot mode.
Any try to flash within 10 sec. but it's always reboot and constantly error every time.
But I have some abnormal before flashing could start and error is .. It's always error as "No update are available for your product".
I have to click "OK" in updater several time til it could start the flashing initialization then Nuvi reboot..
Is it some thing wrong with my cure file..

Note: I cure it by downloaded file as..
- nuvi13xxand14xxseries_GCDFile__620.gcd
- nuvi13xxand14xxseries_GCDFile-MTK__620.gcd
and get the out put file as.. 097201000620.rgn (in generated temp folder)..
And I have to move updater in above temp file before executing it.

Is my curing correct.?
Any further advice is appriciated..

JUR