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 blocks downgrades to iOS 13.3 as jailbreak release looms - 9to5Mac
Tutoriel : Jailbreak de iOS 13 - 13.3 pour iPhone et iPad (A12 & A13) avec Unc0ver sans ordinateur !
How to Jailbreak iOS 13.4.1 with Checkra1n [A11 or lower]
CheckRa1n 0.9.8 : support du jailbreak iOS 13.3.1 et de Linux - iPhone Tweak
Last chance to downgrade to iOS 13.3 on A12/A13 for potential jailbreak eligibility
The Jailbreak iOS 13.3.1 Situation! AND iOS 13.4 Jailbreak iOS 13 Updates! - YouTube
iOS 13.5.1 ferme la porte au jailbreak unc0ver | iGeneration
Checkra1n : jailbreak iOS 13.3 disponible + support Apple TV 4K [Tutoriel]
How to JAILBREAK iOS 13.3.1 Using Windows / Linux | Checkra1n Jailbreak + All Linux Commands – Harsh Sharma Technicals