The Xiaomi Mi MIX FOLD main firmware on this page will assist you update your phone MIUI variation to the current. To move from Beta to Stable ROM (vice versa) or un-brick your phone, you require Fastboot ROM.
If you formerly rooted or customized the system partition of your phone, you need to think about flashing the Fastboot ROM. It will overwrite all existing modified system files to change with factory software. To guarantee that all important information on the phone (like contacts, messages, app data, etc.) is safe, back them all up due to the fact that you could loose information after flashing.
Again, charge the phone to a minimum of 30% so that the flashing process will not be disrupted by low battery. Interrupting the firmware setup implies bricking your phone.
Download either the Fastboot or healing firmware from the link( s) listed below and follow the advised flashing instructions right away after the download alternatives. Do not hesitate to report any damaged links discovered.
Xiaomi Mi MIX FOLD official Fastboot ROM
Xiaomi Mi MIX FOLD Recovery ROM (local update)
Important! Always backup existing firmware before flashing any firmware.
How to flash Xiaomi firmware
After downloading the firmware from above link, get a functional USB cable, then follow the instructions via this link to discover how to flash Xiaomi Fastboot and Recovery firmware.
If you have any concerns or other contribution please post in remarks area for support.