I update my nuvi 855 from software 4.6 to 4.7 and got error message 'not enough storage' during update.
update continued and completed.
when I unplugged nuvi from pc.
now nuvi keep re-booting and cannot go thru to mass storage screen.
here is symptom.
1) without USB cable connect, remove battery, slot in battery
2) GARMIN screen show up. progress start
3) message 'updating hardware manager'
4) message 'verifying bootloader'
5) progress bar reverse
5) re-boot and repeat from #1.
I tried hard reset per instructed, below are what shows
1) without USB cable connect, remove battery, slot in battery
2) GARMIN screen show up. progress start, then press and hold bottom right screen
3) message 'updating hardware manager'
4) message 'verifying bootloader'
5) progress bar reverse
6) pre-boot mode screen show up
7) reboot after 30seconds. no message ask to delete all data.
Try use webupdater to fix issue, nuvi are regconized by the program by says no update required.
Try direct install again software 4.7, but nuvi is not detected as it's not a mass storage
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Shower999