TRUNKS to AVAYA dont work after update to S50-

We have two remote locations to our hospital, one with a S100 on S100- that the trunk still works just fine. The S50 that we just upgraded to S50- the trunks will not work. We have tried removing them and recreating. We also notice that the S50 has this message reporting on the AVAYA that was never there and does not happen with the S100

SIP Reg/Opt Rx: phone
OPTIONS sip:6d352294@;transport=udp SIP/2.0
Via: SIP/2.0/UDP XX.XXX.X.XXX:28123;rport;branch=z9hG4bKPjd622b361-7c40-4bdf-a604-92e05cbca236
From: <sip:unknown@XX.XXX.X.XXX>;tag=d428fe30-09dd-44d7-8b19-c24c90b38888
To: <sip:6d352294@>
Contact: <sip:unknown@XX.XXX.X.XXX:28123>
Call-ID: 4434fa8c-0786-43af-b2c8-7aba779d5436
CSeq: 63722 OPTIONS
Max-Forwards: 70
User-Agent: Yeastar S50-
Content-Length: 0

How can we revert to which was the last working firmware on the S50 or possibly that is still working OK on the S100?

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