After a reinstallation of libjansson the BfgMiner run with my BFx2 Bitfury but at the same time the Bfgminer do not scan my:
8 x BFx2 Bitfury
2 x Antminer U2+
I'm not familiar with the bfx settings, but
Try this:
"scan" : [
"amu:all",
"bfx:all"
],
"set-device" : [
"amu:clock=x0a81",
"bfx:osc6_bits=53"
]