Thread: nuvi 58LM is working but not recognized by Computer

I really don't understand what to do exactly. Here I read the whole thread and again I don't know. I even read in one of your posts you wrote that the fw can be installed if it is just renamed to gupdate.gcd and put on the SD card in the Garmin folder under the condition that my fw is smaller than the one I'm installing.
If you want to help me, you have to explain to me better what exactly to insert and if possible graphically. I understand that you have to be something like that, but I don't know which commands I should enter.