what do u mean it doesn't work with offical snes mini plug? as in you ordered "official" plugs to do this mod and they are somehow different or incompatible with the OPs tutorial?
I was thinking of ordering plugs but now i think i'll just remove the receivers casing and solder jumper wires to the pads.
fyi I have no trouble using two receivers at the same time, latest hakchi2, receiver firm 1.08beta, sn30 and sfc30 controller latest pre-switch firm (not 4.0), also used ds4 and wii pro, no issues.
By plug I mean wall outlet for power (the micro usb power lead to ac power adapter) as I wanted to be sure it wasn't my lead/adapter that was causing the crashes? With no second receiver plugged in I have no issues so sadly I've got to pass on this cool internal mod for the snes mini.