Resetting Macbook on Beta

[AB]

Interesting one which is probably easy to solve but I can't work it out.

Reset an M3 Macbook Air today, it had Beta MacOS 26 on it. It's gone through the process but now wants to 'update' the software to complete but won't do it and also tells me it can't be downgraded so it's kind of stuck.

Any ideas? It won't find my Macbook Pro even when connected directly and on the same network in order to use Time Machine.

Hopefully it's not bricked until the official update of the software.

Thanks.

[AB]

Go me!

For anyone unsure, just delete the partition and let it do it's thing.