Not even Mi service center guys know about it. To be able to flash a stock MIUI firmware through the EDL mode you need MiFlash tool which requires an Authorized Mi Account and god only knows who has those authorized Mi accounts! If not handled properly, your phone will be hard bricked and the phone will only boot into EDL mode and nothing else. But over the years, Xiaomi has locked bootloader, added Anti rollback and many more security checks on its phones. Xiaomi phones have better hardware at the cheapest price which makes it attractive for development as well.
