I think you can use oculus home with DK2 but you will have a message saying that it is unsupported. And touch exclusive titles will not work. Otherwise, yes the runtime 8.0 is the latest that came out for the DK2.
Specs: AMD Ryzen 9 5950X, Deepcool Castle EX 360, 32GB Corsair Dominator RGB 3600MHz, Asus ROG Strix X570-E Gaming, Asus ROG Strix 3080ti, Corsair HX1000, Western Digital SN850 M.2 NVMe 2TB, Samgung 850 EVO 500GB & 840 EVO 500GB in raid0, Seagate Ironwolf 10TB, Corsair 4000D Airflow, Acer Predator X34 3440x1440 @ 100Hz, Acer V287K 3840x2160@ 60Hz, Oculus Rift S, Oculus Quest 2 256GB.
0.8 is also the last version that didn't auto update itself. All of the 1.x series will update whether you want them to or not. So if 1.12 comes out and it doesn't support DK2 at all, there's no way to install 1.11 instead and stay there. However the majority of new software is 1.x only. With 0.8 you'll only be running old stuff since before the CV1 came out.
Hehe i have a bunch of boot ssds for old stuff: -win8.1 with 0.5 for dk2 -win10 with 0.8 for same -win10 with latest (1.12) for cv (and occasionally testing if working with dk2).
So yeah, the latest runtime DOES work with dk2.
Just for info, tried and could NOT block home autoupdate with firewall restrictions (oculus added itself to exceptions automatically after a restart). If you want to keep old runtime, should add oculus.com to hosts file.
no one will help you being dk2 is not supported but I can tell you my dk2 works fine. try cleaning your contacts on your wires being it uses a audio jack for syncing maybe the problem lies with that cord