Many thanks for your reply, Butters.
Incorrect flash or wrong fw is not reasonable, because used up to a moment before putting it in the box (where it remained for 6 months).
And before, updated only with GarminExpress (is a lifetime map version).
Flash chip damaged is plausible, because even the backup of NV region 154 fail:
update.txt:
rrgn,154,2:/BUP_154.bin
reboot
Only a mysterious JEFF.BIN file, appears on SD... Is the soul of my died navigator? :D
A curiosity: in this or similar (Drive serie) navigator, when in pre-boot mode and in normal operation, using Updater.exe, how appears in USB Device field?
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