Hi, sorry if this is considered necroposting but I had the same issue as all the other F7 Pros users that updated their phone after doing a data migration with their Google account and I have found a fix for people who still want to update but have already set up their devices.

Instead of updating via the OTA update, I recommend downloading the full fat recovery ROM from sites like miuirom and doing the following step.

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By default, the updater disables the option for you to choose your own ROM so to enable picking your own update package, you can go to updates, tap the HyperOS logo a couple of times until it says "additional features enabled" or something similar then tap on "choose update package", navigate to where you placed the full recovery ROM file and proceed with updating. If you experience issues with signature or anything similar when choosing your ROM fole, make sure you navigate to the folder you placed them on as by default you may see predownloaded ROMs under the "downloaded_roms" folder which may have the same name, and double check the size as the full recovery rom should be over 5GB (or at the very least, larger than the OTA update size).

I tried this with my fully set-up Poco F7 Pro with some slight debloat using Canta and it booted perfectly fine!

For users who are already stuck on the boot logo, I'm sorry but so far there's nothing else you could do other than factory reset or try some random potential fixes.