Most of the Xiaomi Phones after resetting Mi Account get relock when connected to Internet.
We will use UMT to get rid of Mi Phone getting Relocked.
Solution: Mi Account Relock after connecting Internet;
1- Run UMT QC Fire (Latest).
2- Then Reset Mi Account of the phone.
3- Phone will reboot, When Menu appears in the phone.
4- Make sure to not insert sim & no internet connectivity to the device.
5- Go to Setting, Tap 7 times on Build version. It will enable the developer mode.
6- Now in Power on mode. Connect phone to the PC. Make sure to install Fastboot driver on pc for further operation.
7- Using Umt Qc fire, now click on Anti-relock tab.
This will reset the Relock of the device.
Now, you can insert SIM & connect phone to the internet.