mobile

as title.
I've tried to root my desire 820f (one 4g card version)
but it's fail due to can't found right twrp recovery
I give up now,
but there is one trouble,
my phone had already flash twrp recovery
and it didn't work
so I want to bring it back to stock recovery,
but I search in google for a long time,
and there aren't any desire 820's ruu
so I can't repair my recovery...

can anyone help me to find stock ruu?
version: desire 820f
thanks...