Change SATA Mode in Aspire A515-51G

Here is my setup:

1) Acer Aspire A515-51G
2) Single Hard Drive: SSD 256Gb
3) Windows 10 Installed

What I would like to achieve:

1) Install an M.2 SSD
2) Install Ubuntu on the new M.2 SSD

Blocker:
To install Linux (specifically Ubuntu 20.04) on my new drive I need the SATA Mode to be set on AHCI but my SATA Mode is set on RAID. I can see this in the BIOS Menu Information Tab.

Question:
I have tried using CTRL + s in the BIOS Menu to activate the SATA Mode option in the BIOS to switch to AHCI but the option just does not come up. What should I do? Should I downgrade/upgrade my BIOS Drivers? Please see BIOS driver version below

Image: https://us.v-cdn.net/6029997/uploads/editor/s1/dkklxj8z05cq.png

Thank you all very much for the patience of reading through this and your help.

Accepted answers

All comments

GAMING6698

@adri2392
You must first create the superuser password.
Then save restart.
Access the Bios/main tab with SataMode and if it is not accessible, use Ctrl + S again