In Hope, This relates to my XT10 I believe that the problem I have with my camera is probably down to a blown fuse  on the main board. Various posts mention both a T and 2 O marked fuses but no real specification. On one post there is a link to a Aliexpress but the product does not match the text ( 2.5A or 0.25A) Does anybody have this information as I would rather have the replacement bits to hand before starting to disassemble the camera and then have to leave it in bits will waiting for parts to arrive. Thanks for any help or suggestions as to where I might find the information.. John

I started a thread at DPReviw. It seems you can't change the behaviour of the AF-on button during playback. It toggles each photo between protected and unprotected. But there is an un protect all function in the menu. https://www.dpreview.com/forums/threads/x-t5-im-accidentally-protecting-files-help-please.4822652/#post-68520162

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  Ely Cathedral, Nikon 24mm f/1.8G ISO3200, 1/4s f/9 handheld. Using 35mm mode.

I don't think there is any way to reassign (or lock) any of the function buttons during playback on any X series camera. 

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