It’s not that easy. The configuration is stored in the gateway, not in the eMMC. Also, Tesla might connect to your car and revert any changes you have made. There is more: depending on your fw, some entries of the configuration file might be locked, so you can’t change those without toolbox (3, I presume). Finally, if you have MCU2, all the contents of the eMMC is encrypted, although there should be a workaround.
If you are thinking of rooter’s way of getting root, that was great at the beginning, but Tesla closed all these holes looooong time ago. Now you need to be much more sophisticated to do anything.