Can’t use WhatsApp on jailbroken phone
We don't support jailbroken devices and WhatsApp won't work properly if your phone is jailbroken. Jailbroken devices don't allow WhatsApp to function as intended and your messages won't be protected by end-to-end encryption.
If you wish to use WhatsApp and your phone is jailbroken, you should restore your iPhone to factory settings. For more information on how to restore, visit the Apple Support website.