I don't think that will solve your problem. This is a standard Cisco box that 'badges' the Scientific Atlanta Explorer internals. These do not have separate Power ON/Power Off codes, they use a single Power Toggle code. If it turns the box OFF but not ON then there must be a different problem. Maybe the ON code uses a long press system, which you don't support, maybe the OFF actually puts it into standby and a completely different button (MENU?) turns it back on ?
Anyway, this BIN file is the one you want Cisco and Scientific Explorer 8xxxx and 4xxx Series