iOS 10.2.1 Jailbreak is possible with Saigon tool. It has two methods to complete the Saigon jailbreak process. Those are Saigon zJailbreak online method and Saigon PC required method. Both method install Cydia finally.
For the first time it was released Saigon tool as potential jailbreak with sideload IPA. Second time it released the tool as beta version and now it is available Saigon beta 3 version with adding new features and some bug fixing. This is developed by Abraham Masri (iabem97/cheesecakeufo), and Saigon is a semi-untethered jailbreak. Saigon.ipa beta version supports with few iDevices and according to the developer it will be added all the 64-bit devices later.
Beta 3/Release 1
Supported device list expanded.
It has a better success rate with new exploit than previous one.
Re-write the application completely.
Beta 2r1 (21/10/2017)
Added iPhone 6S Plus, iPad Mini 4 and iPad Air 2 for the supported list.
After jailbreaking, Camera app is working perfectly now.
Device model and the version are visible on the screen.
It added few bug fixing and some changes.
Currently saigon beta jailbreak supports only for few devices. However Saigon jailbreak will be added support for all 64-bit devices later.
iPod Touch 6
iPad Mini 4
iPad Air 2
This is an online Jailbreak and you do not need to use pc to install this. Please follow the below step guide. First, you need to Download zJailbreak or Xabsi from the following buttons.
Step 01 - Open the zJailbreak/Xabsi app and Install the Silzee online JB app available under jailbreak.
Step 02 - Now you have install Silzee Online JB app to your device.
Step 03 - Run Silzee Online JB app from your device and tap on saigon button.
Step 04 - Now it will begin install Saigon jailbreak to your device and finally saigon jailbreak app will appear in your home screen.
Step 05 - Open the Saigon app and tap on jailbreak. It will take a few minutes to complete the jailbreak process.
Step 06 - Finally you can find the Cydia on your homescreen.
Step 01 - Download the Saigon.ipa file from the link below.
Step 02 - Download Cydia Impactor from below install button.
Step 03 - Plug your device to the PC using USB Cable.
Step 04 - Drag the Saigon.IPA file into the Cydia Impactor.
Step 05 - Now it will ask your Apple ID & Password. Enter your details.
Step 06 - After few minutes Saigon jailbreak application will be available on your device home screen.
Step 07 - Now you need to verify the profile.
Go to Settings > General > Profiles & Device Management and trust it.
Step 08 - Now go back to the home screen and open the Saigon app.
Step 09 - Click the Jailbreak button to start the jailbreak process.
Step 10 - Finally Cydia will be available on your home screen.
Note - If it is not successful for the first time, Reboot your device and run the app again.
Abraham Masri has expressed his gratitude to most famous jailbreak developers through official Saïgon webpage. Some of the few already has released jailbreak tools. Luca Todesco released Yalu102 tool to jailbreak iOS 10 to iOS 10.2 versions. Siguza released Phoenix jailbreak tool and it supports to jailbreak iOS 9.3.5 version (32-bit devices only). xerub & ianbeer released extra_recipe+yaluX tool to jailbreak iOS 10.1.1 on iPhone 7 and iPhone 7 Plus. Adam Donenfeld is the only person, who never released jailbreak tool yet. Finally it was possible to jailbreak iOS 10.2.1 version because of these developers contribution.
Saigon is a beta jailbreak yet. It only supports with few devices only.
Also, iOS 10.2.1 running 64-bit users can try Meridian Jailbreak, C0F jailbreak and 32-bit users can try H3lix jailbreak. Also, users can try Houdini Semi Jailbreak or zJailbreak as alternative jailbreak solutions because most of the jailbreaks are still in developing mode.
Visit the iOS 10.2.1 jailbreak page for more details.
We can not expect Saigon jailbreak for latest versions. It seems he left the Jailbreak community. Before he attends on latest iOS version, it needs to release an update for existing Saigon tool for iOS 10.2.1 to improve the jailbreak success rate.
However, there are few Jailbreak /alternatives available for Jailbreak iOS 11 & higher versions as well as iOS 12 & higher versions. It has Chimera Jailbreak for iOS 12.2 to iOS 12 with Sileo & Unc0ver Jailbreak for iOS 12.2 to iOS 11 with Cydia. Rootless JB available up to iOS 12.1.2 Jailbreak to iOS 11. Also, Electra Jailbreak is the most reliable Semi-untethered Jailbreak up to iOS 11.4.1 Jailbreak. Houdini semi Jailbreak also available to iOS 11.3.1 & iOS 11.3 versions.
There are Ziyu repo extractor, Vistian & Anzhuang available to install jailbreak apps up to iOS 12.1.4. Hexxa & Bregxi available for iOS 12.3 - iOS 12.3.2 Jailbreak & iOS 12.4 Jailbreak. Also, Hexxa plus has been released for iOS 13 Jailbreak.