So the 827's boot.bin works fine. This is some good news actually. If nothing else helps, we can use 827's boot.bin, I think.
I guess you renamed RGN taken from 082701000620-org.rar from 082701000620.bin to 097201000620.rgn before flashing.
Please try again without renaming, and check if it shows "LOADER" after flashing.
Renaming was needed only for the healthy device.
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