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Alright, after toying with it for a few days I have cracked dual booting and decided to write up the steps myself. YOU WILL LOSE YOUR DATA DOING THIS. Credit to @order#10248 for proving the concept. First thing you will want to do is re-flash stock android on your phone. There isn't an official repo for this yet but @Waxberry has kindly provided one on this post. Download and extract the files from there and run the script fastboot_all.bat or you can download my modified linux version flash_all.sh. While that is flashing, download the latest version of Lineage here. Yo

Ahh, that's it, thank you! I ran fastboot right on the "START" screen and it worked. Even worked on my X270 without needing to boot up the Raspberry Pi.

I agree with @Hook. That screen in the first screenshot should be shown while you use fastboot to flash the boot.img. adb, on the other hand, does its job only from recovery, not from that bootloader screen. That said, just flashing the Magisk-patched boot.img (which I understand is what you are trying to achieve) does not require any action to be performed from recovery. You should not go there at all for this. The no-command-screen usually indicates that the recovery image fails to boot. It normally should not be shown at any step of a reflashing procedure, and probably indicates t

I'm a little confused by your descriptions. When you reboot to bootloader using adb, you should get the bootloader screen which is the same as your first screen shot way above except I think it says "START" in green at the top. I don't think it matters if you use the volume control to change what is at the top to "RECOVERY mode" because those are options you are scrolling through, but nothing changes unless you press power. That bootloader screen (with "START" or whatever at the top) is the bootloader. That is where fastboot is used. Going into recovery mode (by pressing the power button)

Until we are using tdm's driver, there will be undesirable interactions between the F(x)tec's custom keymap and the keyboard language selection in Android. Have you selected a language and layout as directed by the persistent notification to "Configure physical keyboard"? Don't do that. 😜

Mine would also not boot. Left it connected to the charger and used volume down + power. After a couple of minutes it tried booting. But the battery was completely dead. So after a couple of retries it finally was able to boot fully. Give it a try.