https://wiki.debian.org/wl
Here it said broadcom-sta-dkms driver supports my wi-fi card. But it failed to build the module when I ran:
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sudo apt-get install broadcom-sta-dkms
Maybe this driver can't build on kernel 4.9. Maybe I need to restart in order for wifi to work. I don't know, and I don't wanna risk it. Since live image can't get the Wi-Fi to work, there is nothing else for me to do.
I will try your suggestions, but it's better to keep this image for some other computer (maybe a bit older).
If someone with the same HP model as me gets Debian to work with wifi, he/she is free to post it here.
EDIT: Thank you for really trying to help