First timer questions for this specific rom

Hi!,

This is my first Xiaomi phone (Redmi Note 13 PRO 5G - GARNET) after my whole life using (and flashing) motorola phones. I have already unlocked my BL, and I'm ready to flash.
But I have some questions I would like to know before:

1. I'm currently on HyperOS 1.0.16.0.UNREUXM, wich it doesn't seems to be the latest acording to this page, but nevertheless my phone doesn't offer me a new version (even before unlocking BL). https://miuiver.com/tag/garnet-eea-stable-rom/
It looks...

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