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 Port
The CAN port is a JST-XH header located here:
DFU Mode
To put the Spider 3.0 into DFU mode, hold the BT0 button and while still holding press and release the RST button. Then count to 5 and release the BT0 button.