URL: https://ipwnder.com/repo/ Specifically built for old firmwares. This source contains tweaks like SmoothCursor , NoSlowAnimations , and ResetAllKiller (a lifesaver so you don't accidentally press the "Reset" button in Settings, which would brick a jailbroken 9.3.5 device).
URL: https://julioverne.github.io/ JulioVerne specializes in hacking App Store purchases and tweaks. On iOS 9.3.5, his repo provides AppStore++ (legacy version) and several cracked tweaks that are no longer sold. Note: Some packages may require iOS 10+, so check the description. Sources For Cydia Ios 9.3.5
Why? Because iOS 9.3.5 requires or specific legacy builds of tweaks. Furthermore, the infamous "Cydia was unable to locate the package" error is usually due to outdated sources. URL: https://ipwnder
Once you have added these sources, focus on these tweaks to improve your device's functionality: On iOS 9
: Home to many popular app-specific tweaks (like Phantom for older Snapchat versions). URL: https://github.io