I used the GarminCure3 v0.1 tool by kunix to create cure firmware,
just dragged the .GCD file across selected cure & made firmware,
Managed to enter pre-boot, Neil's way worked for me, upload was successful,
nuvi's internal memory now appears empty...
re-formatted...
Now Im a bit confused regarding Load original F W.rgn
the original F/W I downloaded off Garmin was .GCD
*Thinking i've missed something out! Lack of sleep in my case
Solved.. GarminCure3 v0.1 converts .GCD to .rgn, selected Original/make firmware
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