8.1.2 (jailbroken) to 8.4 (NOT 8.4.1)

I have a jailbroken iPhone 6 Plus 8.1.2 and wants to upgrade to 8.4.

I am not able to restore and upgrade to 8.4 as iTunes always throws me an error 3194. Apple recently removed 8.4 from signing for the release of 8.4.1. I'm not sure if this affects my problem. I already made sure that there's no "gs" entry on my hosts file.

If I can't, should I forever hold my peace? Or I can still reinstall my 8.1.2 firmware (SHSH saved)?

Hope someone can help me. Thank you!