Modem doesn't want to start

[infinitemind2]

Modem was starting, disconnected the device, now the code wont go pass the begin statement
with the follow output

Starting Modem -> Starting modem library... Calling internalBegin
Powering on modem...
..>> AT
Waiting for response OK

<< ..AT
OK
..>> ATE1
Waiting for response OK

<< ..............................................................Powering off modem...

**** Modem failed: error -> Protocol Error

where should i look!

[mikalhart]

@infinitemind2, what version of RB do you have? Some early versions of RB were susceptible to a regulator failure that would manifest in this exact behavior.

[Korka16]

Hi
I have the same problem. i am using an arduino uno. could you find out why is it not working? Can you help me to understand how to fix it please