Jailbroken Iphone 8 Plus

Hello,

I would definitely contact the person you bought the iPhone from to get your money back or to restore the iPhone to it's original state for you. Likely he knows more about the entire Jailbreak scene than me and you.

I googled this for you, and I littirally found this on the first page I clicked source Macworld.com. For all clarity Apple is entirely against Jailbreaking thus this is not supported by Apple Warranty. The information provided below is copy pasted list from an article dated from 2015, I found several websites saying the exact same thing. I personally do not have experience with Jailbroken iPhones, so please be careful.

"It's easy to remove a jailbreak from an iPhone, the process is to backup your iPhone, then reinstall iOS. Afterwards you restore your iPhone backup"

1. Connect your iPhone to a Mac using the USB cable
2. If you have a password on your iPhone, enter passcode to unlock it
3. Click Settings > iCloud > Find My iPhone and set it off
4. Enter your Apple ID password and tap Turn Off
5. Click the Devices icon in iTunes and choose your iPhone
6. Select This Computer under Backups
7. Click Backup Now and choose Backup Apps from the Alert Window
8. Click Restore iPhone and tap Restore in the Alert Window

I hope this helped

Kind regards,

K

To restore your phone to factory settings, follow these instructions:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support