Grand you say? Sarcasm methinks, perchance? Ok, this unit has been a flake ever since you bought it but files size and free-space being wrongly reported takes it to another level. The 'modded firmware' you mention means the US/Asian hybrid is still on it i assume. That in itself won't stop it being recognised in MSM by Windoze. It think it's got something on it that's causing the problem, a gpi or gpx file maybe. BTW, favourites are in Garmin\GPX folder, and yes GarminExpress will backup favourites and other very basic stuff automatically [but i still don't like GE, it's almost as flaky as your goddam 765].

Back before Christmas i suggested you flash cure fw because you posted this:
Quote Originally Posted by RDesikan View Post
OK brand new infuriation: Device has to be restarted multiple times before it stops freezing upon hitting go to destination. Also, device no longer acknowledged usb connection. What now?????
I think the time has come to wipe the internal flash with a proper reformat. If you can't access MSM can you at least still get it into preboot? We need preboot to flash a cure to allow MSM. Use one of Bill's toys directly for that, don't muck around with WINE in Linux or anything else. 765 is a pain to get into preboot and it only stays in for about 10 secs, but if it boots you can access the hidden menu behind the battery symbol and flash at a leisurely pace. Read here: [Only registered and activated users can see links. ]:
If nuvi can boot, try to enter diagnostic mode by pressing battery icon for ~5 seconds and then connect USB cable to computer. It your unit can enter into 'pseudo' pre-boot that way it will hold pre-boot indefinitely without going to the white calibration screen which it will do if a flash isn't commenced quickly enough as in 'normal' pre-boot mode. Particularly handy with 7xx units which are notoriously stubborn about entering and holding pre-boot.
Also read here: [Only registered and activated users can see links. ]. And here: [Only registered and activated users can see links. ].