The quickaccess patch has got nothing to do with K750 patching.
It's only necessary for DB2020 phones (K750 is DB2010).
You can use this tutorial to patch your CID36 K750:
Patching tutorial Farmanager - Top Sony Forums
You can also use GFlash, which has an easy gui.
BTW: Forget about XS++ upgrading your EROM to CID49 automatically ;)