Latest Avast Secure Browser 2 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) AvastSecureBrowser/2.2.0 Mobile/15E148 Version/18.0 Safari/605.1.15 iOS 18 iPhone
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) AvastSecureBrowser/2.1.0 Mobile/15E148 Version/17.0 Safari/605.1.15 iOS 17 iPhone