Xiaomi Redmi 6A

Recently i bought unlocked, second hand Redmi 6A (CN version) from online seller. I wrongly flashed (via MiFlash) Global ROM with "clean all and lock" (i should select "clean all" only). Now, my phone locked and repeatedly bootloop to recovery (cannot boot to system because in recovery, it show "This MIUI version cant be installed on this device")
how to flash global rom