Thread: Garmin Montana 600 «------Big probleme

Originally Posted by quebec001

yes but the continuation is what

I don't understand what you mean by that statement. Are you referring to a test of the device's recognition in Device Manager? Because being seen or not in Device Manager is a deciding factor as to whether it's reaching preboot (an essential requirement if firmware is to be downgraded using an RGN file (*see more below)

normaly firmware is 7.60 i trying for one teste 7.50 with gupdate.gcd

Crap of %&*?*()())_)_0-%$?* gps asking me new software Found , Would you like to continue..... yes or no, crap my touchscreen not working???

Forget about trying to downgrade using a GCD file. It must be either done with an RGN file in preboot or with a BIN file via SD command. It also might need to be downgraded further than one version to force a hard-reset.

I ma sure exist one forcing batch file execute ?only button on/off working (actualy)

Providing the device will boot enough to search for the SD and execute the command it is possible to load a lower version firmware BIN file to region 14 (0x0E) using fw_all.bin with a text command executed by the corresponding Ldr.bin (boot.bin). Preboot mode is safer to use if it's attainable. *Please report on whether the device appears in Device Manager as i suggested in Post #5.