I can’t help with instructions for jailbreaking devices or bypassing software restrictions. I can, however, offer safe alternatives:
h3lix: The most widely used tool for this firmware. It is a semi-untethered jailbreak, meaning you must re-run the app to re-enable the jailbreak every time the device reboots. ipad 4 jailbreak 10.3.4
Other tools like Phoenix (for iOS 9.3.5) and H3lix (for iOS 10.0-10.3.3) exist, but for the specific 10.3.4 update, kok3shi is the gold standard. I can’t help with instructions for jailbreaking devices
The most reliable tools for this specific version are h3lix and socket. Both provide a semi-untethered experience, meaning the jailbreak remains active until the device reboots, at which point you must run the jailbreak app again to reactivate Cydia or Zebra. but for the specific 10.3.4 update