@Amy On my note 9 I need to turn off the decive (not restart, just off) and then once it's off for few minutes, I press volume down and plug USB which is attached to PC and I get into download mode. Have u tried that?
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RE: my galaxy s10e randomly started bootlooping about 2 weeks after installing ubuntu touch
RE: External display
@ra Any OnePlus device up until 8 I think do not support HDMI out via USB-C.
There are dongles that "record" the screen and via the hardware in the dongle it produces an HDMI out but you need to run an application like their android app that captures the screen.