No Serial Connection to RAMPS v1.4

What is the problem?

My Raspberry Pi running OctoPrint won't connect to my RAMPS v1.4 3d Printer (RepRap Guru V1)

What did you already try to solve it?

Restarting both Pi and machine, running Pi in safe mode, parity double open workaround options, unchecking and rechecking "request exclusive access to the serial port", all USB ports on Pi, different USB cables, all baud rates (and auto of course).

Have you tried running in safe mode and if so did it solve the issue?

Yes I have tried, no it has not worked.

Complete Logs

Connection Tab:
State: Offline (Error: No more candidates to test, and no working port/baudrate combination detected.)

Logs.zip (25.2 KB)

MORE INFO

OctoPrint Version 1.4.2 running on Raspberry Pi 3 B+ connected to RepRap Guru v1 3d printer (utilizing RAMPS v1.4 board).