what installs this Android 10 beta firmware if there is an, update what manual update or via OTA?
It's a beta update you have to install this manually. And make sure to backup your data before installation.
Please find Android 10 file: "Version Android 10 to Android P" in the link below:
You may find the upgrade steps under "Version Android 10 to Android P". Please make sure to back up your data before upgrading.
Thank you and have a nice day 🙂