Here’s a guide on how to jailbreak iOS 12.4 using Unc0ver 3.5.x jailbreaking tool on a compatible iPhone, iPad.
1- On the target device (iPhone or iPad that you want to Jailbreak it) open the Safari web browser and visit this URL: https://jailbreaks.fun
Double-check the URL. It has “s” at the end.
2- Tap on “Get” followed by Install. Wait for the app to download and install on your iOS device.
3- Head over to Settings-> General -> Profile. Tap the developer’s name and trust the certificate. You will not be able to launch the Unc0ver jailbreak app on your iPhone/iPad without this.
4- Tap on the blue Trust button, and then tap on the red Trust button inside the pop-up that appears:
5- Open Unc0ver, tap the Jailbreak button and wait for the app to do its job. Your iPhone or iPad will respring several times during the process after which you should see the Cydia icon on your home screen.
If the app ends up freezing, wait for a few minutes. In case that does not work, reboot your iPhone/iPad and then repeat the above steps.
6- Once you are done jailbreaking your iPhone or iPad running iOS 12.4 a new app called CYDIA will appear on the menu. You can now install SPYERA from the CYDIA App by entering SPYERA Cydia Catalog URL.
Cydia icon, Unc0ver icon, and the SPYERA icon may be hidden at the end of the installation process if desired.