Hi,
Just in case, can you check your fastboot version. You need to always use latest platform tools.
https://doc.e.foundation/pages/install-adb
If you still get the same result, I suggest you try installing LineageOS to test.
https://wiki.lineageos.org/devices/sake/install
If it installs OK but /e/ OS not, then we should remove installation packages from the website until the issue is fixed.
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