NEWS] IOS 13.3 is still being signed don't believe the posts that said it isn't signed so if you do need to downgrade or update to 13.3 go ahead and do so :
Apple releases iOS 13.3, watchOS 6.1.1, and tvOS 13.3, here's what's new [U: HomePod] - 9to5Mac
Apple Releases iOS 13.3.1 for Download and More [u] • iPhone in Canada Blog
IOS 13.3.1 LANSAT PENTRU IPHONE, IPAD, IPOD TOUCH DE APPLE | iDevice.ro
Download iOS 13.3.1 / iPadOS 13.3.1 with Bug Fixes for iPhone, iPad
Apple iOS 13.3.1: Important New iPhone Privacy Control Confirmed
iOS 13.3.1 Review: It's safe to install
Apple releases iOS 13 update. Check out the key details | Mint
Developers get their hands on first iOS 13.3.1, macOS 10.15.3 betas
discussion] good tweaks for my 128GB Matte Black iPhone 7 on iOS 13.3.1 : r/jailbreak
Update your iPhone now - Apple releases iOS 13.3.1 with crucial fixes | Express.co.uk
Unable to update New Software 13.3.1 - Apple Community
iOS 13.4 vs iOS 13.3.1 Speed Test Comparison on iPhone [Video]