@askelly
Likely the corrupt file causing it to bootloop is a map IMG file or an associated ancillary file such as a JunctionView JCV file seeing you were updating maps at the time.

Try loading [Only registered and activated users can see links. ]. It's been tested as working to re-enable Mass Storage Mode in nuvi 1xxx devices. You can then locate and delete the likely offending files. After removing suspect files, load original fw and then reboot it before using GE to again update maps etc..

Best to rename QuickCure3.rgn to 097201000630.rgn before using it in your 1490.

In the unlikely event QC3 doesn't work, here's HWID 0972 V6.30 cure firmware RGN in a ZIP file: [Only registered and activated users can see links. ]