Thread: Nuvi 1370 does not detected

ceco134
GarminCure3 can't break the firmware flashing functionality in the real pre-boot mode (as in your case) by design. Something else has happened.
If you can't flash a longer (newer) firmware but you can flash an older (shorter) firmware, then probably the flash chip is dying. You can try comressing fw_all.bin with gfwpack.exe (you can compress both CURE-ed and and ORIGINAL) and making it shorter.
Or it has something to do with boot.bin version (older boot.bin works but newer doesn't), which is also bad (some hardware is failing). Then you can try using the older boot.bin with the newer firmware.

Also if for some reason you can't flash GarminCure3-ed firmware (well, I've seen some devices that refuse running any firmware except some particular version due to unwriteable flash chip blocks), then flash the working firmware and use QuickCure3 for accessing the mass storage mode.