Yes, Redmi Note 6 Pro does have the portrait mode.
Yes, Redmi Note 6 Pro does have the support for FM radio.
During our research, we have got an Antutu score of 88758.
Redmi Note 6 Pro comes with Android 8.1 Oreo version. However, it is expected that soon, the latest version of Android will be available via OTA update.
Redmi Note 6 Pro has a LPDDR4X type of double channel RAM.
The Redmi Note 6 Pro has it all - great display, snappy performance, no-nonsense features, excellent battery life, and very good and hassle-free camera experience. And all this is available at an amazingly low price.