I can't use twrp, I'm told, as it doesn't work with A12I believe the command is : fastboot boot twrp.img
I have a hard time understanding the question, but every thread (such as this one) under "MIUI ROM Releases" match a release (or a MIUI version for the stable ROM), and in the first post you have links to download the ROMs
Sorry about the q on the rom! I had a major brain misfire there!