Download MIUI V12.0.5.0 Global Stable Fastboot ROM for Mi 10T Lite from here.
File name: gauguin_global_images_V12.0.5.0.QJSMIXM_20201113.0000.00_10.0_global_3b65a33882.tgz
Device: Mi 10T Lite
Codename: #gauguin
Region: Global
Version: V12.0.5.0.QJSMIXM
Android: 10.0
Size: 4.2 GB