Ok I am kind of getting what goes wrong. First configure boot options to usb in bios setting as usual.
Then do rebooting. After the screen displays HP logo, pressing esc button, which will again enter the bios seting or that kind of screen but it will ask (the screen will display) with several options, such as
continuous boot
...
boot options
bios setup
...
Then this time, pressing continuous boot or something similar (sorry can't remember the name, but it's at the first option). Now it enters to normal boot process where lovely debian installer asks me to install or use gui blah blah
It also possible my iso did not burn correctly. I did rebrun iso to usb using etcher, which seemingly do validation step.
Anyway, hopes this trivial info may be of help to someone who also runs into some annoying issues (not debian side) similar like mine.
Thanks
Sep 3, 2021, 15:46 by
ster...@tutanota.com: