As MIUI official stock ROM released for the new Mi 9 series some days ago, we added the new devices 'Mi 9/9 SE' to Xiaomi Firmware Updater,
The firmware files, extracted from stable ROM is available to download through our website.
Xiaomi released China and Global ROM for Mi 9, while Mi 9 SE China ROM was only released, once Global one is available I'll add it.
You can also download the full stock ROM from the website. https://xiaomifirmwareupdater.com/roms/recovery/stable/