Mi Mix 3 Global Stable V12.0.1.0.QEEMIXM
OTA Apply to V11.0.5.0
https://bigota.d.miui.com/V12.0.1.0.QEEMIXM/miui-blockota-perseus_global-V11.0.5.0.QEEMIXM-V12.0.1.0.QEEMIXM-4903eecda1-10.0.zip
Recovery ROM
https://bigota.d.miui.com/V12.0.1.0.QEEMIXM/miui_MIMIX3Global_V12.0.1.0.QEEMIXM_029b9f7869_10.0.zip
>>> All firmware: xiaomifirmware.net