Download MIUI V188.8.131.52 Russia Stable Fastboot ROM for Xiaomi Redmi Note 9 from here.
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Archive name: merlin_ru_global_images_V126.96.36.199.QJORUXM_20200526.0000.00_10.0_global_e37cd13eee.tgz
Xiaomi device code name: merlin
Size: 3.3 GB
Caution Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data. BTW, a link doesn’t last forever.