Did you get any luck? I'm stuck with the same issue. Dell support is not being helpful.

Unfortunately no. The problem is still the same

Just to check, did you have any troubles with grub after windows install?

I found tricky way today: install as second OS Windows 10 (with the initial settings, I did not even configure the network) and execute from USB all BIOS updates (1.2.0, 1.3.0, etc) from Windows. Now I have 1.7.0 version on my laptop.

This is probably a bit complicated for some users and doesn't answer my first question, but the BIOS has been updated.

Bruh, I had a feeling it would work like that, but I didn't have the energy to try it.

I don't get why Dell posts guides to update BIOS in a linux environment when it doesn't even work lol.

I guess I'll install w10 for a couple of hours.

Thanks man!

I used this article  and as says there grub don't see windows presence. So you can choose booting Windows or Ubuntu via F12 or update grub for dual boot: sudo update-grub