Hi, I need help with the dual boot installation of Windows 10 and Cachy OS.
My PC does not support UEFI!
I have four partitions. Three of them are Windows and one is supposed to be Cachy OS. After installing Cachy, the Grub Loader cannot find a Windows installation. I have already tried some tips from the Internet, but unfortunately it does not work.
It’s great that you did some research beforehand, even if it was unsuccessful. Have you already watched this video? Installation on Dual Boot | CachyOS
Or this one? https://www.youtube.com/watch?v=rJcrb7vxoCo
Yes, I’ve already seen the videos.
But my laptop has neither Secure Boot nor UEFI.
When I install Cachy OS, I also have no option to select the bootloader it automatically takes GRUB. I also cannot create an EFI partition.
The laptop is an HP 8460p. The device is already a bit older 
This looks like it might have some leads for you. Since your laptop has an experimental UEFI I wonder if you boot with a refind-iso USB if it will be able to see both installs. If so, boot into Cachy, install refind and you will be good to go.
Further useful links can be found here: hp 8460p arch linux - Google Suche gAMgUQIRigATIFECEYoAEyBRAhGKABMgUQIRigAUiiNVCZBlikHHABeAGQAQCYAbQBoAGMBqoBAzAuNbgBAcgBAPgBAZgCBqACtAbCAgoQABiwAxjWBBhHwgINEAAYgAQYsAMYQxiKBcICBxAAGIAEGBPCAgYQABgWGB7CAggQABiiBB iJBZgDAIgGAZAGCpIHAzEuNaAHzxQ&sclient=gws-wiz-serp
Doesn’t look very clear. I have to repeat 07 again. Markdown Tutorial - Links
it would be nice to tell what tipps you tried until now. (e.g. configure GRUB)
no cristal ball present here
True that @hotte
Please post results from terminal @drstraleman , we might check it out.
What does your /etc/default/grub look like ? Make sure os-prober is enabled.
I have tried os-prober and then update-grub.
os-prober finds the Windows installation but they are not displayed in grub.
Then I tried it manually with the UUIID and an entry in Grub. Didn’t work either.
os-prober is enabled
What results do you need from the terminal? How do I get there?
edit your /etc/default/grub and remove the # before “#GRUB_DISABLE_OS_PROBER=false”, towards the end of the file, save it, then run “sudo grub-mkconfig -o /boot/grub/grub.cfg” and then check your menu again, you should be good to go.
paste-cachyos /etc/default/grub. Sorry for the very late reply, this thread went over my radar.