Thread: Using TMC in Garmin nuvi for free

Besides the problem of blocking traffic signal by the firmware 3.10, your cable gtm25 also have a intermittent defect (or not connected to car plug), such that I mentioned in post 589, unfortunately. A blank screen, as shown in your image, denotes that the traffic receiver is not connected,perhaps only the energy part of the cable. If you managed to install the first firmware (Pasta1) correctly (100%), you should be able to install the rest. On this screen and connected at cigarette lighter plug of the car, move the cable in various positions, mainly at the end next to the gps, even begin to appear indicatives data on the Traffic Status Receive screen. At this point hold the position of the cable immobile that the second firmware must be updated. I have a cable gtm25 with exactly the same problem (prior to installation of v 3.10), so I can safely say that is an intermittent (hopefully) hardware contact defect, besides the locking of the 3.10 firmware