I use firmware TRB1_R_00.07.01.4 with SIM Card and public IP.
After entering the "Custom APN" in the mobile interface the device shows the public IP address for a short time. After that, for reasons unknown to me, the APN is deleted and the device changes the IP to a private IP address.
On some attempts, the custom APN is also not saved at all.
I already use other TRB140 without these problems, however, the an older FW version. Also I have already compared the settings with one of my other TRB140.
What could be the reason for deleting the APN?