lol no that won't work. The boot.dat is not a payload.
You need their SX Loader payload.bin instead (and leave the boot.dat as it is on your SD root).
Then rename that SX Loader payload to whatever you want (for example sxos.bin) and place it in sd:/bootloader/payloads/
Then add this entry to your sd:/bootloader/hekate_ipl.ini:
Don't really know how this works with modchips like your SX Gear though.
the purpose of this script is to change the license decryption key. which will allow you to create your own license. you will need to run sxos for the first time to create a license-request.dat file which you will then retrieve from the SD. then you copied it to a folder containing the boot.dat file (unmodified) and the script. you run the script that will modify the boot.dat file to replace the license key and create a license that matches your license-request.dat. copied license.dat and boot.dat to your SD card. and admired the work.
My script was updated by @mrdude and he fix the cheat support and some mistake i made on my first script, @b&nder for his help about the reverse engineering and many thing, @chronoss for his great collaboration a sacrifice for his sx licence , @Zoria , @hexkyz, Shadow and Darkstorm.