As subject, my new Vostro 5568 has problem when i installed M.2 SSD. Now it doesn't have anything on Boot Sequence and I also cannot change to Legacy on Boot list option (it's greyed), when i boot up to windows, i have to use F12 to choose the drive, if not, it say "No bootable devices found". I tried to re-install windows, upgrade BIOS to newest version and even downgrade back to curent version, but its still the same.

Below is my screenshots:

Please help me to solve this.

Thank you so much!