Guide to revert DIR-825 to stock firmware

[Nenhum_de_Nos]

Hi guys,

I had in my memory that there was the link to the recover-firmware process
on the DIR-825 wiki page for freebsd mips. Now I go there and can't find
it. I looked even in the wiki history.

Does anyone could point to a guide? I have some old FreeBSD there and as I
saw all talks about old arch being dropped from FreeBSD codebase I thought
I could set this hardware back on factory grounds.

Thanks,

matheus