120 ohm Termination Resistor
There is a permanent 120 ohm termination resistor soldered to the board, no need to add a jumper to enable it and also no ability to disable it.
CAN mode
To enable CAN mode you must add a jumper between these two pins.
If you don’t have a jumper in place then the board will default to CAN-FD mode which Klipper does not support.
BOOT Mode
To put the PITB V2.0 into BOOT mode for initial flashing, unplug the main CAN cable then connect a USB cable from your Pi to the USB-C port of the PITB V2.0.
Then hold the BT0 button, press and release the RST button, count to five then release the BT0 button.