Apple released iOS 10.3.3 beta just one week ago there are including number of features and improvements. Other thing is this latest update Apple add and fix more security for avoid jailbreak iOS device.
Now Apple has already closed the signing for iOS 10.3.1, are you already update to iOS 10.3.2 you can downgrade your iphone, iPad and iPod to iOS10.3.1 click to use step by step guide. If your current version iOS 10.3.1 please do not update for latest iOS version, because it will be difficult jailbreak and cydia download for your device. Pangu jailbreak team publish demoed for jailbreak iOS 10.3.1 and if you cydia lover you need to stay iOS10.3.1 with your device.
What is the latest version for jailbreak your device
iOS 10.2 is latest version for jailbreak your device, this jailbreak tool released by Luca Todesco named Yalu , this tool support for 64 bit device except iPhone 7, iPhone 7 Plus. You can use guide click cydia download iOS 10.2 using cydia Impactor. Before 10 dar ago PP jailbreak team released other method for cydia download for iPhone, iPad and iPod on iOS 10.2 using PP jailbreak
How to downgrade to iOS 10.3.1 from iOS 10.3.2 or iOS 10.3.3
Already closed the signing window for iOS 10.3.1 and still we have one method downgrade to iOS 10.3.1 from to iOS 10.3.2 you can get step by step guide using above link. There are several method available download and install fake cydia for your idevice, please do not accept that method because it will be damage for your device.