La MIUI has always been one of them best interfaces present in the Android panorama, as it allows a profound personalization both in terms of functions and graphically, making our smartphone unique.
And in fact how many times have you seen an icon pack on the net or rather I would say a theme and have you dreamed of having it on your device too? And unfortunately how many times have you found yourself in the situation of not being able to install it as it seems that Xiaomi has blocked the installation of third-party themes.
This happens especially to those who do not have an official Roma, like the one personified by MIUI.it, but also to those who have the Global Stabile ROM on their terminal, and so often we run into the error: "Issues from third-party sources are not supported error: download | auth rejected 402"
Fortunately there is a very simple way to upload your themes to the MIUI Themes store and then download the third-party themes. I state that the guide has been tested on ROM Global Stable on the smartphone Xiaomi Redmi 3S, 188.8.131.52 version, but try not to harm even on all the custom rom in the circle.
In practice you need to become a Xiaomi Designer and to make this possible just connect to Xiaomi's designer page.
You will need to log in using the details of your Mi Account. At this point you will be asked what kind of account to create if Individual designer or Corporate designer. Not being a designer who will propose his paid themes on the store I have chosen the Individual designer option.
At this point it is necessary to fill in the requested data without having to enter any information regarding any payments, then give the confirmation via the button at the bottom of the page. Now you will need to wait around 24 hours, the time required for approval which in my case has arrived in around 10 hours.
You will receive Xiaomi's confirmation of the activation of the account designer, but don't be afraid if the text is completely in Chinese.
At this point you are ready to download the theme that made you go crazy in the Themes application and tap the Offline icon. Now scrolling down you will find a button with the word Import: the file manager will open where you will have to go to select the .mtz file of the theme you just downloaded.
Once selected, the theme will be imported and will appear together with the other themes on your device. Then select it and click the Apply button.
Perfect now your theme is installed on your terminal.
I hope this little guide has been helpful and let us know if you have any problems but especially if you have finally installed your favorite theme.