If you have updated the game on Jailbreak and find yourself crashing please follow these steps if not on the Electra Jailbreak:
- Add the repo https://beta.unlimapps.com/ in Cydia. Sources tab at the bottom > "Edit" at the top right. "Add" at the top left.
- Once installed search for App Admin in the repo under "System" and install it.
- Go into the App Store after it's done then Press and hold on the "Open" button next to Pokemon Go. Press "Downgrade" in the menu that pops up and then select the previous version from the list that shows up.
If it worked you should see the installing app animation in the app store. Once it's done open Pokemon Go. It should open and run without any crashes.