Unfortunately, it's a matter of testing and letting others know (you may be the only one tryingCan anyone report if the cellular signal issue with the hltespr device has been fixed in this latest build?
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According to the HLTE device tree, Sprint is a supported\listed device but maybe asking @haggertk to have a closer look at it might be the way to go. He's shown to have the best brains for tackling these issues.