Quote Originally Posted by bam-bam View Post
... what exactly happened to not connect to the USB (in this case, it DOES charge when I connect it through the PC, it just does not enter update mode)
This means that his USB port still works...
1. Check there's no corrosion, dirt or other obstruction or bent pin(s) inside the USB port. Clean only with dedicated electrical contact cleaner inside the port. Carefully straighten out any bent pins using a fine metal pick (a tiny precision screwdriver makes a good tool for that). If there are missing pins then replace the socket. If all that is okay and especially if you notice any slight movement of the socket, see below.

2. Re-flowing the USB socket connections to the PCB correctly using lots of flux and good quality leaded solder (hard to get in Europe) will fix a loose socket permanently provided you also strengthen the socket's physical mounting points. It's essential to do that as the mountings can be weak from the factory and almost certainly they'll have cracked too (that's usually what causes the PCB/USB connections to fail in turn). Older 5" models such as nuvi 14x0 and 5x are especially prone to that problem, i've repaired literally dozens of them. Sometimes they will not charge unless the vehicle cable is held in a certain way, or will not connect to PC like the problem you're seeing - neither in Mass Storage Mode, nor Preboot Mode even with Garmin USB drivers loaded on the PC. It's a reasonably easy task to open those devices and re-flow the soldered connections and fix the mounts.

If you rule out the above two possibilities, the likelihood is there's been a failure of a component on the board which isn't so easy to locate and fix without special skills. Not worthwhile of an older cheap device anyway.

Note: I've just now noticed in your initial post that you also tried unsuccessfully to update fw via the microSD slot. If it also doesn't read maps or other files from a card, then that fault in combination with not having a PC data connection demonstrates conclusively it's a critical board failure. Try several other microSD cards and USB cables before drawing that conclusion however. Cards should only be formatted FAT32, other formats won't work. Also use only USB2 ports directly on PC, not USB3 or via a hub or front desktop port.