First flash china stock rom before flashing (yes it will flash on global devices too)
Then,
1. Go to fastboot mode
2. then type fastboot flash super(drag and drop super img provided)
3. then fastboot --disable-verity --disable-verification flash vbmeta(vbmeta of stock china rom)
4. then fastboot reboot recovery
5. wipe data
6. came to fastboot mode again
7. type fastboot oem cdmsl
8. type fastboot set_ active a (this will set boot partition to a )
If you sim fails to work then flash global modem.img and it will work