Thread: Firmware Update for GTMxx Traffic Receiver Type 3 software version 3.10

Originally Posted by bpb

3.1 also not good for me, then just try to find old backup and make a modification at x1027 to 3701 and it's work.
Still need to take out this modified file and put back original backup else it will update the GTM receiver every power up.

Was not aware on checksum but it's back working condition.

Now realized my backup is 3.00 not 2.90 and this is not in update list.

@bpb, as the Loly mentioned, we arrived at the same result, with the difference that we had more work, because we tried to change not one, but several indicative positions of the firmware version and struggling to hit the checkusum, but with the same result of yours, as I mentioned earlier in the post 10, and with a lot of instability of modified version (looping in installation) and subsequent stability and operation of traffic with version 3.00. Although we are unable to resolve the issue of the checksum, it was good to know that gives the same change 1 or more positions in the firmware, because without the checkum, even unstable correction allow the installation of a stable version (checksum FE).
As in your case, my traffic went back to work with firmware v3.00, but only until I install another subscription, and there began my problems. With firmware 2.80 and 2.90 beginning the installation of the signature, but at the end the gps gives warning that exceeded the maximum number of subscriptions allowed. Already the v3.00 fw supports the installation of new subscriptions, showing them in the firmware, but when to turn off the gps or GTM cable, it disappears. So, I assume that it was in the volatile memory of GTM or GPS cable and disappears when reboot. This should be a specific problem of my cable GTM25, becouse I've done countless tests of signatures installation including the Jokers of Europe, Australia, etc.

So my big problem now is delete the subscriptions, remembering that apply a key with xxxx, y, y, 0 only hidden and disables the subscription, prevents the operation of Traffic and not of fact erase it. If anyone has any bright idea, please tell me. I am also very interested in having older versions of gtm25 firmware (G3 ID 901). If anyone has and can post, I am thankful. I have the original versions of firmware 2.80 2.90 3.00, which, I'm posting attached to anyone interested. It is useful to remember the friends who want to downgrade from version 3.10: recommend change, for example, the 2.80 version, unstable, that even allows to upgrade to all higher version (2.90, 3.00, 3.10,). Other information version of parts of firmware that has not changed, continue to be read by the system. So, it is not possible to downgrade to version 3.00 modifying it to 3.11 (unstable), because when installing the v 3.00 original, nothing will happen because the other positions of the fw from the previous version will be read as 3.00, ie, equal and therefore will not install. So, best to use the first version of older installation, i.e., the modified 2.80 to 3.11, to then install the original 3.00.