When using the latest version of TWRP (from 3.1.1-0), there is no need to carry out any manipulations with boot.img, it is enough to boot into TWRP instead of the system after the firmware. TWRP will patch the boot automatically.
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Hello. Sorry of course for the question. But maybe someone will tell you whether the firmware MIUU12 is updated to be updated. And if you can poke into the firmware instruction. Now there is a firmware that was initially. I did nothing with the phone