Little late to the party, but I've found the best way to get into boot loader wiht any consistency is to hold the volume down and power button for five seconds or so, then let go of the power button (while holding volume down), then tapping the po...
Force-checked the update through settings on my Mate SE and the update popped up BND-L34 8.0.0...USTC567D4! Sorry for the bad pic - took it with my Surface
Link as text
delete the space after //
Now with root I was able to remove the horribly annoying Virgin Mobile boot sound - it's located in system/etc -> Bootsound_virgin.ogg - I just added bak to it. Now quiet boot!
It seems that finally some protective cases for the new BOLD-N1 cellphones are starting to appear on Amazon/USA!
I'd be a little careful buying these...