Below some information that may help others who try to flash FW into a nüvi 7x5 with Updater.exe and fail. I used a nüvi 765T, but assume the principle applies equally to the entire 7x5 series (and possibly 7x0 series too).
First off, the procedure to get the nüvi 7x5 into pre-boot mode is as follows:
1. Press and hold the top right hand corner of the screen.
2. While holding, switch on the nüvi by sliding the power switch to the 'ON' position and then immediately sliding it fully right to the 'LOCK' position.
3. As soon as the splash screen appears, connect the USB cable.
My problem was that, in pre-boot mode, I was unable to fully complete the flash process. The progress bar would advance up to 98 or even 99% and then freeze, followed by an error message a few seconds later.
After many attempts, I found out that the flash process would only complete if the power switch was moved out of the 'LOCK' position back into the neutral (mid) position during the flash process.
For efficiency reasons, I tried to move the switch from the 'ON' position to the mid position in step 2 above already, but then I was unable to get the unit into pre-boot mode. It apparently has to be done as an additional step during the flash.
Not sure if I had to post this information here or in the Firmware section. Mods please feel free to copy or move this post to another section if deemed more appropriate there.
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