Murena Pixel 7 yellow triangle on booting

on my Pixel 7, bought from Murena now on /e/OS-Version 2.8-t-20250219470165-official-panther appears on starting/booting the attached Screen with a yellow triangle
is this a normal behaviour?
many thanks in advance

Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

Yes it is.

The reference on your screen g.co/ABH points to Understand warning about operating system safety - Android Help where there is an explanation, albeit from a Google point of view.

It includes the idea of verifying that “the code… hasn’t been changed or corrupted” … yes the code has been changed from Google to /e/OS.

It is further explained as a feature of Verified Boot, Boot flow  |  Android Open Source Project. You are receiving a Yellow warning which signifies

YELLOW: Warning screen for LOCKED devices with custom root of trust set.
… a custom root of trust has been set, and the image was signed with this custom root of trust.

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many thanks for your prompt reply