I have a Nuvi 855 which I wanted to use again. I tried updating the firmware but my laptop suddenly powered down. Now I can only see the Garmin Logo in the GPS. I can do a Pre-boot but that's about it.

I have followed and downloaded all the tools:
GarminCure3
GarminMapUpdater
Firmware - I have tried looking for my model online but I can only see a .exe which I can't use in GarminCure3

I downloaded a .rgn Nuvi8xx_regionfileonly_470.rgn and tried using it in GarminCure3 which I then got an error message.

Processing C:\Users\Eric\Desktop\Garmin\nuvi8xx_regionfileonly__470.rgn
This is a RGN file.
got an exception:
XRgnSection::Load(): REGION_HEADER.const52!=0x52 at offset=0000002D

Processing FAILED

Can anyone help me?

Thanks in advanced

I was also advised that the gps I have is running with a Linux software? Any other fixes I can try?

Thanks