I had a similar effect.
Seems that is a feature when you adjust a higher version number because it looks like the FW version is written in serveral places in the FW.
I adjust at epix from 3.10 to 3.13. After updating the device shows only 3.10 in system menue but in GarminDevice.XML shows 3.13.
It seems the device now thinks after restart the gupdate.gcd is newer (3.10 vs. 3.13) and instead of deleting it wants to do update + restart endless again.
After success i deletet the gupdate.gcd manually and is was ok.
Is there any gupdate.gcd on your device?
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