So your original attempt to backup rgn41 using 37x0 ldr.bin overwrote your 3490's HWID 1376 to 1101. That's why it wouldn't then accept cure3 fw 137601000xxx.rgn made from 34x0 fw but would accept 110101000xxx.rgn made from 37x0 fw.
A caveat to ensure ldr.bin is the correct boot.bin for a unit's HWID.
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