@Elizar Thanks for your answer 😁 Hopefully, I have not bricked the modem but I think you are right and I have unfortunately bricked it ... I have contacted Pycom support to know if they have a way to repair it. If not, then I will probably just buy a new one. Thanks again 😉.

To your first question, both firmwares are fine. The second question applies to the modules shipped from December 2019 and after and is not related to the firmware version difference. The last question, it is fine to sign up with Pybytes. The Pybytes library is always in the firmware (even if you did not sign up), but once you disable the connection, it will not connect to the Pybytes servers.