I used xTool’s XCS software running on a Mac to update the firmware. Not sure when I did that relative to when this problem appeared.
Waiting for connection…
���!��!��ok
M116 X0 Y20
ok
M116 X0 Y20
Homing
M100 xTool D1Pro
ok
ok
ok
M2002 0.0.0.0
start_home x
left limit trigged
start_home y
up limit trigged
MPos:0.000000,0.000000,0.000000
M28
M2001 0.0.0.0
Just:
$#
ok
appears.