I can confirm this works.
I use clips to hold the 4 buttons for me, one hand holding power button and the other hand plug in the USB cable.
I needed to do this because I tried to root, flashed patched boot.img by magisk (v29.0) and then the device was stuck.
With this trick I can enter fastboot and flash the stock boot.img and bring it back to life again.
Quote:
Originally Posted by tombert
I figured it out, at least one way, and I haven't seen it documented so I will put this here so that it gets scraped by search engines.
On the factory reset screen, if you hold all four of the face buttons *and* the power button at the same time for ~15 seconds, and plug in the USB *while still holding all these buttons*, that seems to get it into fastboot mode. From there I was able to flash the stock boot.img, do a factory reset, and it's back to its normal function.
Holding all those buttons and plugging in the cable is easier said than done. It helps if you have another person to plug in the cable.
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