Polaris Issue still remaining. How do i downgrade with broken signing keys?

I have a RX580 in my machine on which i wanted to try bazzite on. The install happened today.
I immediately noticed the warning of it being a "problematic GPU" and on the next reboot i had Black Screen.
After some research i found out that this is a rather big up to date issue that is still going on and needs fixing.

Now i reinstalled it and tried to downgrade via rpm-ostree rebase ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-deck:40-stable-20240424
Sadly i got this annoying error: error: Creating importer: Failed to invoke skopeo proxy method OpenImage: remote error: cryptographic signature verification failed: invalid signature when validating ASN.1 encoded signature
Found out that i had to run a script. Thing is: I have to reboot afterwards which throws me back in the broken gaming mode on reboot...
I am completely unable to get out of there and i will have to reinstall bazzite again probably...

What can i do now?
Is there some ISO repository where i could get the old stable ISOs?

I apologize for missing knowledge. This is my first time trying bazzite and any fedora based systems,.
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