So, I bought a used HP Probook 9470M recently and wanted to install Windows 10 on it. After creating a bootable USB with the Rufus tool, I tried booting with it but it didn't work. I read around and saw that the SecureBoot and Legacy options need to be disabled and enabled respectively but that doesn't help either. Also disabled FastBoot.
I also tried with Legacy mode and UEFI (with and without CSM) modes. Nothing worked. I also tried booting the USB on my other laptop and it worked.
The boot option menu only shows Notebook Hard Drive and Notebook Ethernet.
Best Answer
Solved it. Turns out HP 9470M has 3 USB 3.0 ports but won't recognize a 3.0 USB on startup. Tried with an older USB 2.0 and it worked.