Yes I've tested it on that model in Samsung's Remote Test Lab on their developer website and it works.

Use the latest version 2.0.12 in the unverified version of this guide. I tested it on devices in Samsung's Remote Test Lab and it should work for your S21FE.

Verwenden Sie die neueste Version 2.0.12 in der nicht verifizierten Version dieses Handbuchs. Ich habe es auf Geräten im Remote Test Lab von Samsung getestet und es sollte für Ihr S21FE funktionieren.

Did you try the latest version 2.0.12 from the Samsungparts link in step 1 in the unverified but updated version of this guide?

Can you please add s23 series support for in the future as I have an S23 Ultra. Also for those of you who have the "try again after getting new version" error just change your device's date to Oct. 1st 2022 or earlier.

Can you please add support for the fe series devices because I have an s20 fe 5g and need to replace my battery.

I want FE support as I have an S20 FE 5G.