Steps to do to change from dev to stable in samsung s9+

I have a samsung s9+ in dev 0.16 and wanna install the stable one. And when trying to adb sideload the stable the download 0.16 gives me error in twrp. What I am doing wrong?

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

Does that mean you plan to downgrade from 10 to 8? Best to double check and read the warnings. https://doc.e.foundation/devices/star2lte/install

damm. ok so stable is in 8 still??

Have you ever tried with a TWRP version 3.3.x-x ?

Yes, indeed. I have been alsousing the latest TWRP