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Issues upgrading V-core3.1 to toolhead v1.0

I am upgrading my v-core 3.1 to a toolhead 1.0 (orbiter 2 + rapido 2 + EBB42 1.2) following a print failure that destroyed most of the printing head.

Both the main board (octopus 1.1) and the toolboard (EBB 42 1.2) show as "detected but not responsive" in the configurator.
I have eventually updated the firmwaare by SD card but the firmware on the toolboard doesn't seem to have been updated.

Currently the hotend temperature sensor (PT1000 from a Rapido 2) is reading temperatures around 150 million degrees Celcius. (it fulctuates)
I've manually changed the max temp to above that to be able to actually start klipper (not turning the heater on, obviously) .
sensor is set as sensor_pin: toolboardd:PA0 and sensor_type: PT1000.

I use this printer for work and would greatly appreaciate any help as I have late orders I need to produce urgently.

What do I need to do to get a proper reading on the hot end temperature sensor? (to me it looks like an open circuit but I don't know how else to set the pin for the sensor)
side question: Do I need to connect the Super Pinda probe to the main board or toolboard? I've seen both in several documentation. Does it matter where it is plugged in as long as it is set as such in printer.cfg?

Thank you in advance.