The original (not fake) Tanix TX6 works with 3Gb of RAM (this is the maximum value for the h6 chip). You need to use the APPEND string without a parameter with a 2GB memory limit.   Improvement of the cooling system is required (I remove the case cover, place the case with the radiator up and add a fan).   Yes, this is possible using a script But be sure to make a full backup of eMMC with the DDBR utility before installing it