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HI guys,

I just doing some prints and I noticed those error Commands which are not known to Marlin 2.0x platform:

Recv: ok
Send: N10 M104 S230*85
Recv: ok
Send: N11 M542*16
Recv: echo:Unknown command: "M542"
Recv: ok
Send: N12 M551 P32000 S900*26
Recv: echo:Unknown command: "M551 P32000 S900"
Recv: ok
Send: N13 M543*19
Recv: echo:Unknown command: "M543"
Recv: ok

Those I see at the start of a print when I am opening my gcode I do find those at around line 490 :

; *** Main G-code ***
;
; Reset extruder pos
G92 E0
; BEGIN_LAYER_OBJECT z=0.308 z_thickness=0.308
;
; *** Selecting and Warming Extruder 1 to 230 C ***
; Select extruder, warm and wait, purge
G4 P0
M104 S230
M542
M551 P32000 S900
M543
;
G92 E0
;


I hope this helps the dev team.

I don't think is a bug. Check Settings Printer->Firmware->Firmwaretype

M542 would only used by 3d Systems 3d Printers. For most 3d Printer "5D - Absolut E" is normal choice