Did you reinstall theme hax after copying the payload? If so it wi have reverted the payload back to 2.1.i downloaded the payload- 10.1.0 27u ropbin and named it menuhax_ropbinpayload,i put it in the root of the sd card,i was asked whether i wanted to overwrite the previous file of the same name i did yes and i have 10.1 o3ds
Edit - also the payload needs .bin extension.