How to update your 501
First erase everything in your NB 501 by using file: "Reset Receiver Patch" .After that u can use the firmware :"ABU63021T7-Normal_U" & the cam files :"bruce_lee2_update". After finish , now u can use the latest EMU (u can find daily updaited in Here) with the latest Softcam also daily updated.
I hope everything will be ok
All u need for ur NB501 u can find.
HERE
Best regards
The Admin Team