Dell R630 mainboard with oscilloscope probe on the serial console for the BMC
https://social.v.st/system/media_attachments/files/112/718/292/740/922/651/original/790528ef2815bb19.jpeg
@domi code execution on the Supermicro BMC was easier than your printer. the serial console prints "Press enter to login" and drops you to a root shell without any password. Dell iDRAC on the r630 does the same thing, although it had at least a 3.3 kernel.
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