Same issue here, did you fix it?
cochinet
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Mérida, YUC, Mexico
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A twitter user pointed that I should change the APN from web.5g.attmex.mx to modem.nexteldata.com.mx. Maybe this got change during the upgrade process. This fix it for me.
Quién sabe qué hicieron esos vatos de ATT que no jaló esto... también me pasaron otro APN que quedaría como web.attmex.mx y con ese igual ta jalando. :)