Btw. as a side note, I tried using AI to solve some issues. I abandoned it, when it kept repeating that the /dev/ttyUSB4 was for AT commands (it’s 2; 4 is for audio) even after I provided correcting info. And at one point it was convinced that the modem had no audio functionality - or at least that L5 wasn’t capable of pcm audio (probably because it’s not explicitly mentioned anywhere). It got funny when I realized that it was repeating stuff from this forum as it’s main source - and most posts here are not solutions 
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