Today I just upgraded the MIUI to version 7. Actually, it prompted for the upgrade since some times last week. But I failed to upgrade, expected to be server problem.
So, today I determined to find the solution for manual upgrade. The upgrade version is MIUI 188.8.131.52. I visited the official site and searched the ROM, but the official site does not have this ROM. As a result, just did a search, and found the target ROM in the MIUI official forum. Then everything becomes easy now.
In order to upgrade manually, we have to identify the filename of the target ROM. If we can start downloading the ROM file partially, then we can get the filename from the folder downloaded_rom.
Then to download using our desktop web browser such as Firefox, make a search online for the filename. For my case, it is “miui_MI3WMI4WGlobal_V184.108.40.206.KXDMICI_9830c22421_4.4.zip”. Make sure you are downloading from the official forum, where the file is located in the true MIUI server.
After download the ROM file, copy it to the downloaded_rom folder, run the system upgrade, then the phone will use the ROM directly. The phone skips the step downloading the ROM which may be very time exhaustive.
Finally, reboot, and upgrade success.