Thread: Enable 3790 features on your 3750/60

My regions look the same, but I dumped them after trying 34xx firmware. I returned back to 37xx and then cleared region 140 without any visible change in nuvi. My guess is that region 140 could be responsible for 34xx features.

This is summary of my experience with 37xx regions (maybe some are changed by 34xx firmware).

These regions are readable with length greater than 0:
rreg 05: 512kB some code
rreg 14: 20MB firmware
rreg 15: 2MB empty
rreg 16: 3MB logo
rreg 34: 128kB - region with ID
rreg 41: 6MB - nonvolatile memory, some kind of header (FAT?) on the beginning, than dats xored by C5 3A
rreg 43: 128kB data/code with string CHSETTINGS
rreg 45: 128kB empty
rreg 48: nuvi internal disk image, not sure what if greater than 4GB
rreg 86: 1.5MB empty
rreg 127: 64M resources
rreg 132: 4kB config? with string METADATASIG
rreg 139: 20kB config? string "01"
rreg 140: 20kB config? data 0 and 1
rreg 141: 20kB empty
rreg 142: 32kB empty
rreg 143: 36kB empty


I have made several failed attempts to flash SG-MY 3.00 firmware to my nuvi 3760 EU/US. This is what I have tried:
- clear region 41 and flash SG-MY
- flash SG-MY and then clear 41
- clear region 140 and then flash SG-MY
- clear data area 0x10 - 0x1F in region 34 and then flash SG-MY
- write region 34 and 41 with dumps form nuvi 3750 and then flash SG-MY

I think I can clear more regions and try again. Would be helpful to know how regions look in asian devices or in 3750 which can be converted.