Is there anyway to downgrade to a previous fw ?

I could factory reset but it will only detect the latest fw and i'm back where i started.

I'd like to pick a previous fw (just one previous) - the reason being is a ludicrous update where the doorbell when pressed will automatically call my phone (IOS)

previously it sent a banner and i had to tap the banner to speak to the visitor - great just what i wanted.

Now it rings everytime the door bell is pressed which i dont want in a busy office environment or in a business meeting.

The App no longer allows me to select NO I dont want my phone to ring - i only want a banner notification.

I need Doorbell Video Call on or off - or to be able to select Banner notification only rather than it calling me very time !

So how do i roll back the fw and where are the links to the previous fw versions please ?