This firmware is only for Xiaomi Mi 6 with Qualcomm Snapdragon 835 as CPU.
Download MIUI 11 by xiaomi.eu 9.9.26 Beta v2 Android Pie 9 for Mi 6 from here
Type: Global Beta
MIUI version: MIUI 11
Android version: 9 PKQ1.190118.001
Size: 1.40 GB
Platform: Qualcomm Snapdragon 835
Image name: xiaomi.eu_multi_MI6_9.9.26_851f6620d3_v11-9
Build number: Xiaomi/sagit/sagit:9/PKQ1.190118.001/9.9.26:user/release-keys
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.