Copy a clean untouched 3.10 sxos boot.dat file into this directory - call it boot.dat.orig

Run SXOS-GFX.exe to generate an out folder that contains some bin files (created from the theme folder).

If you have an original SXOS license - run Original-License-menu_sxos.py to generate a themed boot.dat.

If you want to use a cracked SXOS license - run Hacked-License-menu_sxos.py to generate a themed cracked boot.dat.

Copy boot.dat (and license if using a cracked  one) to your sd card....enjoy your new themed sxos.