You're right ,your Navcore i too old for the 835.2419 map.
And yes you can use the 8.412 posted above.
Will give you a new menu and some new functions as well.
You might have to update the bootloader as well - but first check if everything is working after the update ,if so I recommend keeping the bootloader.
You can check the tutorials for the tools you need to activate the map- I recommend the Keygen 3.1F.
It's pretty straight forward : make a good backup using the windows explorer.
Delete all files and folders off your device and copy the new files and folders for the Navcore on it.
Add the new map folder and start the GPS to generate a new ttgo.bif - do the setup and ignore the warning that you can't use the map on your device.
Connect to the PC and run the keygen -make sure TT Home is not running in the background.
Klick on "make map keys" and enjoy
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