Apple News
Saurik Releases Third Beta of Cydia for iOS 10.1.x Jailbreak
Due to the early stage of development of the 10.1.x jailbreak, it is inherently unstable and one part of this, though by no means the largest, was that Cydia had not received any tailoring to work with it until now. Yalu seems to do some things differently from previous tools, and as a result users had been reporting various bugs with the package installer. These ranged from messages warning that the program was 32-bit and might slow down their device, to the inability to select anything within the Cydia interface.
Although I strongly recommend that users avoid using the current Yalu jailbreak for iOS 10.1.x, if you have already used it to jailbreak your device then make sure to install the latest build of Cydia. You can do so by following the guide below.
How to Install Cydia 1.1.28 Beta
Step 1: Open the Cydia app on your jailbroken device.
Step 2: Go to the Sources tab. Tap on Edit -> Add and type in the following URL: http://apt.saurik.com/beta/cydia–arm64/ . Then press the Add button to add the repo to Cydia.
Step 3: Once the new source has been added and Cydia refreshes, you should see three new available upgrades in the Changes tab. These are labelled as “Cydia Installer”, “Debian Package” and “Tape Archive”.
Step 4: Tap on the Upgrade button in the top right corner of the Changes tab and install the available upgrades. Once the installation is done, respring your device.
The latest build of Cydia should now be installed on your device. Rest assured, we will see more Cydia updates in the coming weeks to iron out all the known issues and provide a smoother jailbreak experience.
I recommend keeping an eye on the known issues page I linked above to stay informed of current bugs and fixes as the betas progress; you can also use that page to report any issues you encounter. With luck, this new build should improve quickly, especially once the jailbreak itself receives a few more compatibility fixes.