Will toggle view between regular and hex editor. Unfortunately switching between these views somehow modifies the file. It'd be great if it haven't had any side effects. Maybe someone knows a better way to do it.
noremap <F10> :call HexMe()<CR> let $in_hex=0 function! HexMe() set binary set noeol if $in_hex>0 :%!xxd -r let $in_hex=0 else :%!xxd let $in_hex=1 endif endfunction