For the current stage, I've build an env with python and gcc which I'm working around.
Then I build from the official OpenWRT Repo with branch 21.02,
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The basic build config are as follows:
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The overall menuconfig
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The target image section:
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The output packages:
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What I have done is using the "squashes-sysupgrade.bin" for either Redmi or Mi(The latest breed for r3g on my redmi device told me that the chip is MTK7621A, which belongs to Mi and not Redmi) to refresh ROM of my device, but the breed told me that "It cannot recognise the upgrade file.".
What's wrong with that, I can't find anything (breed log included, for absence of COM device) explaining how did this problem arise.
By the way, I've tried using just the official builds from https://downloads.openwrt.org/releases/21.02.2/targets/ramips/mt7621/, and tried for Mi and RedMi, which both failed for the same reason.
If anyone cloud help me out, I would be more than appreciate.