Could these here apply perhaps? …
“Warning: Please note this upgrade build could not be tested as there were no device specific testers available. Some devices may need a revert to stock ROM prior to upgrade. To flash the stock ROM you would need to use a tool provided by your vendor. You may also need to download a recovery image built specifically for your device.”
“Caution: Before following these instructions please ensure that your smartphone is on the latest Android firmware available for your device. For example if available, before flashing /e/OS ‘S’ install Stock Android 12. Similary before installing /e/OS ‘R’ it should be Stock Android 11 or before installing /e/OS ‘Q’ it should be Stock Android 10. Check you device vendor’s website to download the required Stock ROM.”