[POCO M3 ROMs, Kernels, Recoveries, & Other Develop] GCarmon:
Well, a pain-solver solution for many aches that was right there after an extensive pain-in-the-ass time I have had with the Xiaomi blockade against removing all their firmware, while counter-intuitively the solution was sitting quietly waiting.

Step-by-step: go to xiaomiflash and grab their own stock ROM flashing tool. Afterwards, google your phone model + xiaomi EEA and go to the link that takes to their site. These are the European Union Stock ROMs, GDPR-passing to the firmwares of each component. But remember: their tool require you to download the FASTBOOT ROM and extract it to the root folder on your (usually) C:\ drive.

Now flash it with their own tool with the Clean All option, and afterwards simply IGNORE the lock warning (or else, lock back your phone, then unlock it, why not have an extra dosis of adrenaline?). Green bar writing Done/Flash Done (or something like that?) means it all was good and done.

Grab your SD Card and put in at the root of it the latest Evolution-X ROM you got here and the latest PBRP (the only one OFFICIAL now for this phone) and presto! Your SDCard is ready. Insert it.

Also extract the PBRP .zip file and grab the .img file. The .img file is the one that you’ll will be issuing the 'fastboot flash recovery' command with. Afterwards, send the 'fastboot reboot’ command and QUICKLY press the Volume Up/POWER buttons at the same time until the phone trembles and you only release the Power button and enter PitchBlack Recovery Project (the TWRP that simply works for our phones). Disconnect it from the cable on the computer and go ahead.

Flash the PBRP zip you have in the SD Card, remembering to always untick the 'disable DM-Verity' option by any name that it could be called, reboot it to recovery and now get ready for the final round.

Final Round: format Data (click yes then swipe, I always do it twice, but it’s your call) first. Then on the middle option, the main offering, Wipe Data/Dalvik/Cache ONLY. Ignore all other options of wiping or else redo it all from step 1, stairs and ladders style. You were warned. Do not mess with Vendor or ANYTHING ELSE AT ALL.

Mount internal storage. Should be empty. Then mount External Storage, this should be a party. Leave External Storage mounted and...

…go to the 'File Manager' that is inside 'Advanced', and navigate to each and every folder, and inside each one of them touch the Check icon to the mid-bottom right, select Delete then swipe, effectively deleting each and every folder on the SDCard you have inside the phone.

What you just did was putting all the latest stock firmwares that are approved by the GDPR inside your phone and deleting EVERYTHING that could create havoc on your custom ROM.

Now go and flash the Evolution-X ROM, remembering to always untick the 'disable DM-Verity' (yeah, do it from the SDCard, no problem! Mine was an ANCIENT one that was lying around since my latest-fastest-128GB-that-flies-and-makes-coffee-(almost) was inside another production machine and, well, this should be for flashing, why would I need a superspeed with many IOPS? I figured. And WORKED).

Voilà. All should pass with flying colours, be installed, your firmware of all the chips and camera and speakers should be wiped clean and replaced by the Evolution-X ones, together with Vendor and everything that makes your phone simply WORK.

(Oh, and later on install NOVA Launcher or something alike, pay for the full premium version and be happy with having no Google Search bar ever again).

Have a blast. And remember to stay hungry, stay foolish. This should apply to us all, always. Hope that this piece of text helps someone, those were just my 2 cents for this BRILLIANT piece of ROM. (Amazing work you all did, Devs!)