I was following this guide to install /e/OS on a Pixel 5 after having made good experiences with it on my Fairphone 4. I made it to successfully flashing the custom recovery image, but booting into recovery fails after showing a Google logo leaving me again in Fastboot Mode.
The phone was on Android 12 before which might be a problem judging from this previous post. Running fastboot devices still shows the device.
Any ideas how I can best proceed from this state, what are my options?
Just a word of background info. The /e/ install instructions seem to be missing a red ink paragraph which once read,
Caution: Do not install /e/OS on top of a higher version of stock OS. Before installing /e/OS ensure your device has the latest stock OS of the same version as /e/OS. If only lower versions of the stock are available then install the last available lower version before installing /e/OS.
This is really the background to the suggestion you already linked by @chrisrg.
If you continue to read that link, the method can all be done from fastboot, but you have to resolve the Android 12 Android 11 issue, first.
I would be inclined to do that job within the “manufacturer system” and test, then come back to these install instructions.