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Hi,
First of all, only UMi Diamond and London have received such complaints ever, so I don't know how you could find that, most of UMi's firmwares have the same problem. On the other hand, the presence of such issues in stock ROMs was never proven. I've got a UMi Diamond in hand, always turned on and connected to the internet since its release date but I have never received any ads or any kind of unwanted apps or any kind of unwanted activity on my phone. I have 3 friends around me using UMi Diamond as their daily driver but no one of them has ever had such issues. After disassembling the system components reported as infected files, I couldn't find any infected elements by virus checking.
Unfortunately I don't have a UMi London in hand and only 2, not so close friends of mine use it but they haven't reported any issues.
I extracted the content of the V3.03_20170307 ROM and it does not contain the FineSearch.apk, FineVideoPlayer.apk, webcore.apk, LovelyFonts.apk and LovelyFontsService.apk files. Launcher3 is the stock launcher, checked on virustotal.com and it's not infected. The SystemUI app manages the notification bar and some other system UI components, it's a part of all Android releases of any smartphone, checked and it's not infected. The AdupsFota.apk manages the wireless (OTA) system updates. It must connect to a Chinese server or it couldn't work. Some virus scanners report it as a suspicious file but not infected.
I suggest you to flash the V3.03_20170307 ROM (downloaded from here, not from another site) in firmware upgrade mode, then do not restore any saved backups, not even the one saved by google.
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