Always verify the file’s MD5 checksum if provided. The correct Mi 6X firmware files will have filenames like: wayne_global_images_V12.5.1.0.QDCMIXM_20220113.0000.00_10.0_global_6c1f3e1ba6.tgz
Since the Mi 6X was primarily a Chinese release, the "Global" MIUI ROM is technically a port or a converted version for the international market. mi 6x firmware
In Mi Flash Tool, click Select and navigate to the extracted ROM folder. Always verify the file’s MD5 checksum if provided