I've not used my X-t3 for a while, haven't changed any settings since I last used it & it was working fine. But now everything through the viewfinder & the images it takes are massively under-exposed & dark, in a weird, grey-ish kind of way. Please see image attached; it's hard to capture in a photo, but this was a well lit setting, with the camera on: Shutter 125, Aperture 5.6, ISO 400. The image is way too dark (nb it's not blue like in the photo, just really under-exposed). I'm thinking of doing a factory reset but can't find how to do this.
Help!