I would like to review the troubleshoot file. I have sent you a form to fill out, and once it’s completed, I will contact you privately. Please use the ticket ID “9556”.
The firmware on your device is the latest available.
Could you clarify if the messages are being read in PDU mode?
And what about single part SMS - is it received properly?
Have you tried using a SIM from a different carrier? While this is unlikely to be carrier-related, if you have the option to test a different operator it would be useful.