re establishing {TAIL ~ wireless communication} with {HEAD ~ the external device} in the primary channel mode when a response to the synchronous scanning is received; and 
re establishing { TAIL ~ wireless communication } with { HEAD ~ the external device } in the primary channel mode when a response to the synchronous scanning is received ; and
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH