Jailbreak Central - The Best Jailbreak Forum!

I want to downgrade iP5s to 10.3.1 from 12.1.1.Blob was saved of 10.3.1.Is there still possible with use of 10.3.3 OTA baseband and modified Buildmanifest to downgrade to 10.3.x?

I would like to do that myself I have same phone and blobs for same version  10.3.1 
I tried but I get error
Maybe Geosn0w can guide us

I'm Going through this method https://www.reddit.com/r/jailbreak/comme..._ipad_air/

I get error sep not signed when I tried that

Did your restore failed and you Restore to latest signed firmwere ?