Best way to flash /e/ on brand new Pixel 5

I went trought all steps of easy installer but i now have :
:warning:
Can’t find valid operating system.
The device will not start.
:scream:
I think i’m good to follow your steps @piero or at least reflash e./OS/ because last working OS was android 12 stock so i guess that’s easy install of e./OS/ that corrupted it…