What specifically did you try? What was the outcome? If you can paste some terminal output from your efforts into the thread that is often very informative.
Did you try this one? Garuda Installation failed, bootloader installation error - #25 by FOUR_7777 It’s a fairly unconventional process but it seems to have worked for a few people (like this one: Bootloader install failed - #15 by future-XD).
What is the exact error? Paste the input and output into the thread if you can.
Yes, don’t give up! 