Normal it doesnt see .img
We have to change some values related to some extensions (.img .GCD .gpx .gpi .zip .vpm)
Why ? Coz one of these files prevents our nuvi to boot normally , changing the extension the firmware wont find the corrupted one anymore and will boot.
Cure doesnt see the corrupted files (.img .GCD .gpx .gpi .zip .vpm)
Remove the corrupted files who prevented your nuvi to boot, remove any gupdate,gcd in nuvi and then reflash original firmware with Updater.exe in preboot mode. Be sure to use the right one for your HWID.
At the end run Webupdater