Is there any way to upgrade my jailbroken iPad to a higher jailbreakable iOS?

Solution 1:

Short answer

No, unfortunately not.

Explanation

Without any manually saved SHSH blobs for your desired version of iOS and your device you cannot upgrade to this version of iOS.

Check https://api.ineal.me/tss/status to see which firmware versions are currently being signed by Apple.

As of today Apple signs only this iPad 4 (iPad 3,4; 3,5; 3,6) firmware:

10.3.3 14G60

Additional Resources

You may check whether there are SHSH2 blobs available for your device:

https://tsssaver.1conan.com

You can get you ECID by

1. Lauching iTunes
2. Connecting your device using a Lightning cable to your computer
3. Selecting your device in iTunes
4. Clicking the serial number twice