No question is stupid if helps you out. You'll need to have the bootloader unlocked unless it says RKBMIXM in your about phone section. EEA is RKBEUXM. If you're in Europe, I would stay with the EEA ROM because it seems to work better in general. Global might offer some better cellular signal in other places but it's iffy. I haven't really seen a difference in signal after switching from EEA to Global (I'm in the U.S). If you want to install it after unlocking the bootloader, then you should wait until c.mi.com uploads it on their site since it will be in a better format for it.
Yes. You will get OTA updates. Banking apps work on mine just fine which is on global, unlocked, and has magisk. According to
this, all 5G bands in the UK are supported. Widevine L1 is working on mine still after clean flashing Global.
This ROM isn't meant to flash from a different variant since it's an OTA. If you want flash the global ROM, follow these steps:
- Unlock bootloader with Xiaomi MiUnlock tool (you'll have to wait 168hours)
- Download the ROM you want from here
- Then follow this guide (skip step 2 in this guide since you've already downloaded the ROM you wanted)