I installed this Fax unit and DIMM from another 4550ci. I reinstalled the firmware. I did a U671 and did a recovery Fax DIMM. Every time it gives me C0620 Error. The machine that I installed the new fax didn't previously have a fax but it did have a DIMM. I installed the DIMM that came with the the fax from the harvest machine and also the one in the machine. Still comes right up (after boot up) with the C0620. Any help would be so appreciated. I've been messing with this for awhile...
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