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Having problems like "Auth | 402 rejected" "Third Party theme is not authorized"?
* (The first method / without root) Use the application "MIUI Theme Editor", you can download it for free on google playstore. watch this video.(see video how to use it
* (The second method / Root + Xposed) if you know
xposed app, install xposed and enable this module.(For MIUI8 and above version
or For MIUI7 or below version
* (The third method / UBL + TWRP) Use custom rom that has support third party theme like miuipro, miui.am, globerom, xiaomi.eu, etc.