Here is how I updated my quadcopter (with FC-1.1.36 firmware also)
HUBSAN H501S - H501SS UPGRADE SOFTWARE (OFFICIAL)
https://mega.nz/#!qxpkgRSY!iJnCW6hBWH-js2l_3E4tEl2Hr6vKeJrVb6IPMtyjwK0
Read well the content of this ^^
HUBSAN H501S FIRMWARES APRIL 2017 (OFFICIAL)
https://mega.nz/#!75ABDB6A!Mzq0Eld09x4_BBd2sh94p5WIFYlgj4_2NZb_y-Nprjo
HUBSAN H501SS FIRMWARES APRIL 2017 (OFFICIAL)
https://mega.nz/#!7gpyUBjT!jmRfHb9tidPEtMZ3DIW-VI4x9a1-dVOo6fSSTvADhXw