gpg: assuming signed data in 'twrp-3.1.1-0-fp2.img'
gpg: Signature made Son 21 Mai 2017 03:27:38 CEST
gpg:                using RSA key 1D8597D7891A43DF
gpg: Good signature from "TeamWin <admin@teamw.in>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 9570 7D42 307C 9D41 D09B  F709 1D85 97D7 891A 43DF