PLEASE ACKNOWLEDGE: This WILL delete all of your tweaks and repos. Your tweak preferences will be kept, but please make sure to backup all of the tweaks you have installed, and all of the repos you have added.
1. Reboot your device, either by using the Power Off button or force restarting.
2. After your device has rebooted, uninstall the old XinaA15 app in TrollStore.
3. Once deleted, download the new XinaA15 IPA from here
4. After it's downloaded, install the new IPA in TrollStore.
5. Once the IPA is installed, open the new XinaA15 app.
6. In XinaA15 settings, enable: Reinstall the jailbreak environment
NOTE: Enabling the option is required for a successful upgrade from a lower XinaA15 version.
7. After enabling this, tap OpenJailbreak to re-jailbreak.
8. Once your device has rebooted, XinaA15 should now be updated.