I was plodding along here testing a gpy with 1.20.1.r1 littleFS firmware when lte=network(LTE) started giving 'OSError: Couldn't connect to Modem!' I tried import sqnsupgrade; sqnsupgrade.info() & it couldn't find the modem either. Looking grim.
Googling led me https://forum.pycom.io/topic/5294/oserror-couldn-t-connect-to-modem which seemed to suggest it was maybe firmware related so I rolled the gpy back to 1.18.1 r7 still no luck.
This is the second GPY where the lte modem has died. Any tips on anything else we might try to get the modem back? Anyone else having this problem?