I somehow erased all the boot options in my bios (maybe caused by some operation using super-grub disk). I have tried to fix my grub using boot-repair live-usb. After performing recommended repair and reboot, there is still no boot option in the bios, and I'm brought to the bios setup screen itself everytime I boot.
Complete information about my setup is here.
The whole story started when I found my windows cannot boot (BCD broken error). Then I thought it was a grub issue so I used boot-repair in my linux and performed the recommended repair. Then I found I cannot get into my linux either, only left with a grub> prompt. So I tried super-grub disk and super-grub2 disk live. Then I found I've basically erased all my boot-options in the bios/uefi. Now I've installed another linux (kubuntu) in hope that the new installation could fix the grub, but it didn't. So I finally tried boot-repair live usb and performed the recommended repair, but still no luck. Any idea how to fix this?