SG-2240: showing corrupted serial number

  • Secured a SG-2240 off eBay.  I was able to flash it to 2.4.2 (haven't used /dev/ttyUSB0 in forever) and got Corebios up to 17.  When I open the admin panel, the serial number is showing up corrupted with only ?s.  How do I get this fixed?

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