htc u12+ flashing twrp, stuck booting I've been trying to root my HTC U12+, and I've been stuck trying to boot twrp onto my phone through adb commands.
.\fastboot boot twrp.img
Sending 'boot.img' (32424 KB)                      OKAY [  2.006s]
Booting

This is what I'm stuck on, my phone screen says &quot;flash images success 1/1)&quot; When I know it's more than one step.
I've got all the drivers, correct adb files, and correct twrp disc images. I rooted my brother's U11 using the same process, with the U11's files.
My reply from the XDA support thread was already posted here, however I will formally reply now that if you're seeing &quot;flash images success (1/1)&quot;, then you're in Download mode. In order for the &quot;fastboot boot&quot; command to work, you have to be in Bootloader. There is an option to &quot;reboot to bootloader&quot; from the main Download mode screen. Choose that option, and then you will be in the correct mode to use the &quot;fastboot boot&quot; command.
You mentioned U11, however the difference with that device is that it has a recovery partition (U12+ does not), and thus the install method for it is to flash the image, not boot it. If you wanted to fastboot boot a recovery image on U11, you likewise would need to be in Bootloader mode.