Hi,
Honestly, 4.2.2 is a very old one. So I am not sure if bootloader update mechanism is properly working then.
May I ask why not just upgrading your jetpack version?
Also, want to ask one point here. Does the data on TX2-M really matter? I just want to make an experiment that if you do the reversed direction of cloning, what would happen on TX2-M?
I mean
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Reflash your TX2-NG to back with sdkmanger. And reflash the board again with the dtb provided by vendor.
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Clone the image from TX2-NG to your TX2-M.
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Check if TX2-M hit same “Press Enter for maintenance” log in serial console.