(also started this on Telegram)
Basically, I did the bad, was trying to flash this when I was on UI2 Android. I did the steps described here, and my phone was stuck in booting sequence, couldn't run anything. Somehow, miraculously, after holding power button for the nth time, it booted into stock Recovery. I wiped user data (all), and the phone managed to boot. However, I am now paranoid that another restart will cause the same issue. How much in the deep am I if I flashed this vbmeta.img? From what I understand, vbmeta is a separate partition, so I believe stock Recovery didn't do jack to it, and it'd have booting issues again. I am planning now to install/boot into unofficial TWRP for UI2 from here:
https://xdaforums.com/t/android11-twrp-3-5-2-for-realme-7-on-rui-2-0.4316289/page-2 But, as I've said, I flashed some unknown vbmeta, and I'm not sure whether I can proceed. What would you recommend?
If anyone's stuck in booting, what helped me:
• unplug cable from PC
• hold VolUp+Power till it reboots 4 times
• when you see Realme's logo for the 4th time, release the buttons
• wait 10s or more
• hold just Power button
• phone somehow boots into stock Recovery
• wipe ALL user data
• reboot