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LJ PRO mfp m521dn/A8P79A - Rebooting

HI, can you help me with mfp, the problem is - after poweron, when the line that shows the progress of loading reaches the end, then - screnn is black & "?" is lit, after second m521dn reboots. I guess that smth wrong with PCB`s, but maybe coldreset or firmware upgrade will help me? Thank`s in advance.


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