Samsung discharged a beta form of Android 6.0 Marshmallow update in the most recent seven day stretch of 2015 for the Galaxy S6 and S6 edge devices in the UK. In any case, what’s bad about the S6 Marshmallow update is that the beforehand working form of Marshmallow TWRP recovery (from Lollipop) doesn’t work any longer on the Marshmallow firmware.
Fortunately, for the remainder of the world with universal S6 (920F) and S6 edge (925F) close by, it is anything but difficult to flash/install a UK firmware and get the Marshmallow beta update legitimately by means of OTA.
What’s more, you need TWRP to get simple root by means of the most recent SuperSU beta. Fortunately, a few people over at XDA have stirred up a TWRP recovery assemble that is perfect with Galaxy S6 Marshmallow firmware (G920FXXU3ZOL6).
This recovery assemble, in any case, is just perfect with Galaxy S6 devices running the beta Marshmallow firmware, NOT the Galaxy S6 edge devices. This is because S6 edge has a bent screen, and TWRP doesn’t go well with that until it’s modified to fit it.
Also See: How to Root T-Mobile LG V20
You can get the Galaxy S6 Marshmallow perfect TWRP recovery from the download link underneath and just unfasten it to get the Odin flashable .tar file.