Hi,

I followed the following instructions posted on making a cure firmware but I was unable to get 2565 into pre-boot mode.
Whenever windows 7 x64 detects the gps, it cannot install the device usb driver because the gps preboot mode only turns on for a few seconds.

What steps have I missed?

1. Power OFF your Nuvi.
2. Press and keep holding the most left upper corner of the LCD screen
3. Power ON your Nuvi but DON NOT release your finger either from Power button nor from LCD screen (keep both pressed until the procedure ends)
4. You will notice Nuvi boots in Pre-Boot mode. Now quickly connect your USB cable.

Regards