Gl503 SSD Not detected in BIOS.

[sleepymickey]

Hi, I've this problem since beginning. I'm using this from july 2018 my spec's are
i7 7700HQ
128GB SSD
GTX 1060
So basically whenever i boot my laptop up, it just open the boot manager or BIOS saying there's no bootable drive inserted. I've tried resetting the default settings but nothing happens even i updated my BIOS using winflash.
Sometimes my laptop boots up when i restart it many times. Like 5-10 times.
Can anyone help me?
You can have a look on the video through this link.
https://drive.google.com/file/d/15hG...w?usp=drivesdk
Thanks in advance.