Home Page › Forums › Raspberry Pi Shields › "warning: alarm synchronization problem" when trying to pppd gprs call › Reply To: "warning: alarm synchronization problem" when trying to pppd gprs call
Ok, not sure why they’re not making this information more “in your face” but apparently some of the boards have a manufacturing defect and pin 20 shouldn’t be connected. I have a stacking header between the shield and the pi so I just bent pin 20 away and put the shield back on. Power the shield and run the script – connects just fine now. I found this info in the post regarding sending SMS. This information needs to be front and center and not buried in some unrelated post.