Hello,
I found this and maybe it is usefull for you.
Title
Mitel DECT phone 6x2d V1 shows rescue mode and Error code: M4, M3, M2 or M1
Symptoms
after device startup, display shows the unexpected text "rescue mode" and Error code: M4 Contact support
Device is not registered to the DECT system anymore
Unexpected IPEI in the menue: 00019 0000000 5
Resolution;Repair trials like e.g. Master reset, SW update via USB and so on do not fix this HW related issue.
Device must be send to the repair.
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