yes you can take out the sim, it takes 1 week to unlock the bootloader. be sure not to add another miui account in your existing account or bind another miui account in the developer.
install with data format? this is related to img.boot partition. Try to reflash twrp. be careful as you might corrupt nvram. select compatible twrp for your unit.
this version of eu miui 12.5.3 all working no bugs. very smooth responds. no need to flash magisk already built-in. i flash the latest twrp for redmi 7 and it works 100%. a million thanks to you :)