This time he claims that the upgraded device will be waterproof, have an aluminium and liquid silicone casing and it will support category 6 LTE.
It's also claimed that the One M8 Prime will have a 2.5GHz quad-core Qualcomm Snapdragon 805 processor, a 5.5-inch 2560 x 1440 (QHD) display and 3GB of RAM- very much similar to the Galaxy S5 Prime leaks we've been seeing.
A bucket-full of salt
Our very own mobile editor Gareth Beavis has previously poured water on a similar HTC M8 Prime leak last month.
He explained that the Prime could be the codename for the HTC One M8 Max, a potential upcoming HTC Phablet with M8 specs.
We contacted HTC and it told us that "HTC doesn't comment on rumour or speculation".
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