I see that the download site has 203 Beta5 software for both the Mango and the Beryl, although for both the file size doesn’t look like it has changed. Are you looking for users to try this and test something particular?
I have both.
For Mango you can try.
MT1300, pls hold a while. Upgrading the wifi driver.
Mango on 203B5 seems fine. Holding off on the Beryl.