Please can you try to try this:
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Install the OS onto a Hard drive SSD or HDD, but not eMMC on the new and working Odyssey x86. Connect the new 4G module and see if it’s working properly
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If it’s working properly, plug this Hard drive that contains this OS to the original x86 and plug the new 4G module and see if it works. (Checking the old x86)
This also seems strange to us, would be very helpful if you can help us narrow down the bugs.
Sorry for any issue caused
Best Regards,
Anson