Even if sent out for repair / replacement you need to know if it's been unlinked from the previous owners DJI account. Don't waste time & money on a drone you can't fly anyway.. anywhere. Apparently you can't contact the seller for help with that...
I believe so, they should work with any controller that has a HDMI out, although depending on the HDMI connector on the controller you may need to use a HDMI to HDMI connector to match what is on the controller. The BT-35E uses the standard HDMI...