Try to say that directly to miui via twitter, Facebook or email, I doubt that they read this forum more than occasionally.
Sent from my LT18i using Tapatalk 2
Go to XDA Arc forums and search for the official Miui topic in the development forums. In the bottom of the first post you'll find an updater-script file that is meant for the LT15i, replace the one in the zip file with that one (that you downloaded) and flash wiping data, cache, system and...