

aye, i’ve only played with mtk chipsets with lancelot (redmi 9) and one other phone i can’t remember (it was an oldie, released around 2016 - i think it was the redmi note 4?)
generally from what i remember (this was a good couple years ago) the mtk exploit lets you pretty painlessly unlock most mediatek xiaomi phones, and should still work just fine to this day - haven’t really seen anything change in the mediatek sphere lately. ironically in contrast to you i remember looking out specifically for mediatek devices because of this exploit (and purely because it skipped the waiting time, otherwise mtk phones should unlock just like qualcomm ones (though according to the xiaomi unlock wall of shame (linked in Kroko’s comment) phones with unisoc chipsets are not unlockable, but at the same time i have yet to see a unisoc xiaomi phone)).
i remember the particular tool i used but no matter what i try i can’t find it anywhere anymore. even then you can still find many exploit tools and guides on the web. after a quick search i found the ‘main’ mtkclient tool (this one), and guides on xiaomiui and droidwin (i recommend going with droidwin, since i trust it, and it uses the main tool i linked, while xiaomiui gives you a tool from a random sharepoint server, which is… uh… yknow)
i also unlock all xiaomi stuff through a virtual machine, and i recommend you do the same, since stuff around unlocking xiaomi phones is often very sketch (that, and also it usually leaves tons of junk on your pc you’ll never use again). virtualbox offers the simplest way to do this, though if you’re running something like QEMU/KVM everything should still be possible.
also i’ve noticed that modern xiaomi phones use qualcomm chipsets exclusively, so if you want to aim for mediatek phones, you’ll only be able to find low-performance ones. if you want an mtk xiaomi phone, i can recommend the redmi 9 - i’ve used it for 4 years before i switched, and it’s a very feature rich phone with decent performance (200k score on AnTuTu v8, while something more modern, like the Mi 10T Pro i’m currently using has a score of over 550k), currently runs for $40-80 on the used market (at least on my end), and is officially supported by LineageOS (nevermind, it’s officially discontinued, but it still receives updates from time to time, and you can still build the ROM yourself and install it)
True that. Possibly the reason the Redmi 9 Lineage ROM became discontinued, maybe it just wasn’t worth the effort.