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.
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.