I've got a new Xiaomi Mi4i, brilliant machine, now all I need is to make it work. Got some help last night but too many choices on that page and no procedure advice. This started because I wanted to set United Kingdom as my Locale. Upgraded Miui which didn't help. Looks like I need Marshmallow. Found too many upgrade methods, some seem out of date, others with missing links. Please advise which is the correct upgrade method to use for Mi4i in the UK. Although reasonably capable I am new to Android and want to be cautious. Keen to avoid coding!