I recently acquired a ST-901 tracker from a Chinese seller. But the device can’t establish a connection to the GSM operator (orange led keeps blinking forever, blue gps led is lit). Tried several sim cards that work normally on 2G on smartphones and other trackers. My next step would be asking for a refund.
But before that, trying to solve this, I noticed that there’s one unsoldered pin on the GSM chip. Because this is my first unit of this model, I can’t tell if this is OK or not. Could you guys look into your ST-901 trackers and check if this is OK?
It’s the 6th pin (left to right) on the side close to the power cable. See the image (arrow inserted):