Pysense+FIPY getting the error "Modem not attached"

[radhikachengappa]

Pysense+FIPY getting the error "Modem not attached" I did the steps mentioned for the firmware upgrade: https://docs.pycom.io/tutorials/lte/firmware/ and upgraded to the latest version.
<<< Welcome to the SQN3330 firmware updater [1.2.5] >>>

FiPy with firmware version 1.18.2.r7

However when I try the following

from network import LTE
lte = LTE()
lte.attach()
lte.connect()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OSError: modem not attached