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Atlas 550 Firmware Update

I have an older Altas 550 with current firmware "ATLAS 550 Rev. B.02 10/05/00 13:07:09"

I am trying to update so it will allow a Quad T1 module (PN: 1200755L1). 

When I attempt to start the update I get the error "no valid slots are available". 

It is not even attempting to connect to the TFTP server. 

PLEASE help. 

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