I have the following case nuvi 1310:
A friend of mine tried to load fw on unit (as he explained preboot mode->fw), he have loaded fw with HWID 972 (the correct one as 1310 is not MTK), but also and fw with HWID 971 and in that way he apparently bricked the device. He thought that HWID does not matter much....
Somehow he succeed to load again fw 6.30 with HWID 972, or at least g7towin shows that it is fw with ID 972 on device.
Preboot mode - not possible to execute as unit screen is not responsive at any corner and over G. Unit starts ok with Garmin logo and shuts down after aprox. 30 seconds.
USB cable works ok. At WIN7 based laptop at start of the unit device manager program see that there is some Garmin device is connected, but of course I could not access the device.
USB drivers (latest version) are installed.
SD card commands not accepted despite I have tried with 972/971 and even with 1104 (MTK).
Also disassembled the unit, removed battery, checked the connections, etc. Same result with attempts to load FW with SD card.
Question is - what else could I do to revive the unit, as at my level of knowledge, no other options left?