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Emperor The command you're looking for is sudo clr-boot-manager update
EFI systems don't have GRUB.
Try this for the mount settings https://www.techrepublic.com/article/how-to-edit-linux-drive-mount-point-options-using-a-gui/
Can't create more than 4 primary partitions.
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[deleted] I figured that there must be additional settings and managed to do that 
But this terminal commands always require some password and I just can't type-I begin to write it and I can't-the only thing I can do is press enter and abort the command-I experienced such problems in various Linux distros on VMs...so this is from the stupid linux-y things...
I remember I could do something about it, but what is it?
Update: If it is truly that it's for security reasons and you have to just type the password then the command is not working-I write the command...then write the password and enter-there was no text informing what happened or whatever-I am just on new line to type other commands.
It looked successful to me (no error).
sudo clr-boot-manager set-timeout 5
See if that helps you (reboot after successful) and watch closely (5 seconds isn't long)
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Well it still doen't work here is a video of the process:
https://youtu.be/MCuME5H96RA
And here a picture when I click F12 when booting(if that matters somehow)
That's odd. You should have got a 5 second window to choose which bootloader (text screen).
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dbarron So there is something wrong either with the command or again with fucking HDDs, formats and so on.
Let me give you a bunch of information-maybe some of it will be valuable:
I was with W7 and used the free update to W10-as we've seen W10 is on MBR HDD.
Later I added the second HDD-2TB...after long issues it's now where the bootloader of Solus is and it's GPT HDD.
So is there a problem, because;
1) The 2 bootloders are on different HDDs.
2) The different HDDs are differently formated-one is GPT and the other MBR.
3) Even the format of bootloaders are different-Solus is on FAT32, while W10 on NTFS.
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Yeah, I think you're only suppossed to have one bootloader. Just multiple entries in the EFI.
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dbarron So the question remains-what do I do xD
Simply deleting W10 bootloader will result in unabillity of booting in in my opinion. Because I can't display both OS with 2 bootloaders, I probably would't with just one
Or I should delete it and then run the sudo commands, but what if it fails?!
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What you needed to do was install the bootloader from solus on the same disk and partition as the Windows one was using, so they live together. Otherwise (as you stand now), you have to choose the proper disks as boot device every time you want to change which boots.
I can't really tell you how to do this, because I never really retain these things. I just do them (and I'm visually oriented..I have to do/see it).
dbarron Well from what I understand I can do that-I need GRUB:
https://superuser.com/questions/202057/how-to-list-hard-disks-to-choose-one-to-boot-from-at-the-startup
But don't know what is this and how to do it...meanwile I will search if there is GRUB in the software center.
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dbarron The case is Emperor has W10 installed in MBR. Solus is installed in EFI.
Emperor It's normal that it doesn't display the password (not even asterisks) for security reasons. No output means usually that the command is successful.
Emperor Solus uses GRUB only in MBR mode. So either you have to boot into Windows via your motherboard's boot menu (which works as intended) or reformat your Solus HDD and reinstall in MBR mode.
In my honest opinion the best option would be to reinstall W10 in EFI, and select the OS via motherboard's boot menu, as that's the intended way.
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[deleted] Reinstalling W10 would mean that I will lose all programs-this is just too much work-I prefer to boot from W10 for my father and when I need to use my PC I will boot via F12...
Although are you sure both of them must be only MBR or GPT?
On multiple places there is that list of commands that you mount different bootloaders, then do some commands, from which the final one is update-grub(your favorite xD).
I may be completely wrong, but it sounds logical to me to show the locations of different bootloaders to GRUB manually and tell it to give you choice when you boot(like Solus-dev/sda....; W10-dev/sdb...; if choose bootloader 1-start Solus, if choose bootloader 2-start W10).
https://askubuntu.com/questions/681422/grub-menu-not-showing-with-dual-boot-uefi-mode-installation
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Emperor Well, then you can just change your motherboard to boot from P1 by default, so it would boot W10 in case you don't press F12.
Wow what a brutal journey and much learned. This is how it works for many sometimes including me. You made it to the other side. Great people helping here, too.