Android 10 arrives on the Xiaomi Redmi K20 & Mi 9T
The Redmi K20, sold as the Mi 9T in Europe, is one of the latest smartphones that Xiaomi has upgraded to Android 10. We shall refer to the device as the Redmi K20 hereafter, for the sake of clarity. Part of the initial MIUI 11 rollout, Xiaomi launched the handset in June running Android 9.0 Pie, and it upgraded it from MIUI 10 to its latest in-house OS in October. However, while its Pro sibling moved up to Android 10 builds of MIUI 11, the Redmi K20 remained on the older base of Android 9.0 Pie.
The cheaper of the two K20 devices is now receiving a new update to bring it in line with the K20 Pro though, following closed beta testing. Piunikaweb reports that the OTA has gone live in China, weighing in at a hefty 2.3 GB. Xiaomi is yet to announce when it plans to bring Android builds to the Global Stable branch for the Redmi K20, so you will only see the OTA if you have a Chinese model at the time of writing. However, Xiaomi usually brings both stable branches onto the same version of Android, so the appearance of Android 10 builds on one suggests that the other will receive them soon too.
If you are already running Chinese builds on your Global K20 for some reason, then Xiaomi.EU has uploaded the build to SourceForge and Android File Host if you would like to flash it. You will need to have TWRP installed and an unlocked bootloader, though. Alternatively, you can download the update from Xiaomi's servers, the link for which you can find here. Please keep in mind that you will need to cross-flash the build if you have a European or Indian handset.