Here comes the link for the global rom
http://bigota.d.miui.com/V9.1.4.0.N...EI_20171110.0000.00_7.1_global_dacc13a599.tgz
Unzip it using winrar then change the extension of the file to .zip. Unzip again to obtain a folder containing necessary files. Use miflash to flash new rom. Goodluck.