So I tried upgrading Proxmox to the latest new firmware but for some reason it refuses to work. I'm trying to remove the 6.8.4-2-PVE entry so that only the 2nd option of 6.5.13-5-pve is available. The 6.5 version works perfectly fine and I can connect to it no problem. The new 6.8 refuses to work and has a lot of problems. How can I remove the 6.8 entry and just stick to what works?