I have been researching this for about a week now. what i have done so far is
- downloaded cure3
- downloaded nuvi2x5W_GCDFile__760.gcd
- opened cure3, added the nuvi2x5W_GCDFile__760.gcd file, ticked cure, match cure, update.exe
it then updates to the gps the gps shows installing etc then it reboots and goes back into a loop.

I cannot get the gps to go into mass storage mode to continue with the RMprepusb software.

if i have missed some steps or miss understood something please correct me