The iOS 10.2.1 Saïgon jailbreak has been updated by Abraham Masri and incorporates Siguza's new v0rtex exploit. The same vulnerability as Ian Beer's exploit for iOS 11 is used and v0rtex for iOS has replaced zIVA as the kernel behind the Saigon jailbreak. As a result, Saigon is much more stable compared to the past.
Saïgon beta 3 will also support more devices, but still on a limited range of firmwares. The list includes:
iPad Air (Cellular) (10.2)
iPhone 5s (10.2.1)
iPhone SE (10.2.1) (not tested)
iPhone 6/Plus (10.2.1)
iPhone 6s/Plus (10.2.1) (not tested)
iPhone 6 (10.3.x) (not yet)
It's possible that the remainder of 64-bit devices will eventually gain support in the coming months. V0rtex technically works up to iOS 10.3.3 and on all devices up to the iPhone 7 and iPhone 7 Plus. However, more work is required before a full jailbreak can be released.
Devices released prior to the iPhone 7 will likely be first to get iOS 10.2.1 support, followed by iOS 10.3.x with support for 32-bit devices possibly coming from tihmstar. iPhone 7 and iPhone 7 Plus support will be last in line since their hardware protections will need another exploit or an entirely re-written Cydia Substrate.
The full changelog for Saigon beta 3 includes:
Significantly better success rate using new exploit (v0rtex)
Support for more devices (partially tested)
Complete re-write of the application
If you're looking to update from an earlier beta version, just delete the old Saigon app, reboot the device, sideload the new beta .ipa with Cydia Impactor, and re-jailbreak.
Do you plan on running Saigon beta 3 on your iOS device?