Tutorial for having multiple kernels with the Kernel Manager?

[HardCode4All]

So I took the leap of faith, installed the LTS kernel, was able to find it in rEFInd (thanks @PalynDrumatiX for pointing me in the right direction) et voilá:

╭ Keys ──────╮╭ Values ─────────────────────────────────╮
│ Host        ││ MasterComputer                          │
│ Machine     ││ MS-7E26  1.0                            │
│ OS          ││ CachyOS   [vrolling] [x86_64]           │
│ Kernel      ││ Linux  [v6.12.43-2-cachyos-lts]         │
│ Running     ││ 83 days                                 │
╰───────────╯╰─────────────────────────────────────────╯

That was easier than expected.

Update: An LTS kernel as fallback is now part of the regular CachyOS installation!

I will keep this tutorial for reference, but it might not be necessary any longer:

1. Use Cachy Kernel Manager to select another kernel. Keep your current kernel selected, too.

2. Click “Execute” and wait until the process is finished

3. Reboot

4. In rEFIND, select the right operating system with arrow keys (please excuse the dusty screen):
   

   

5. Then press TAB to enter the advanced settings:
   

   

Here, you can select the different existing kernels

6. Press ENTER and boot into the selected kernel
7. Done.

Refind always boots into the “latest” kernel by timestamp, so if you want to boot into another kernel you could just update its timestamp with

sudo touch /boot/vmlinuz-name-of-your-kernel

THREAD CAN BE CLOSED. THANKS TO EVERYONE HELPING OUT HERE!