Greetings,
Could you please clarify which device model you are using and the firmware version you upgraded to?
What is the model of the PLC?
Could you describe your use case and what requests you are using? Are you using HTTP or HTTPS?
If you were using the mobile POST/GET service, you can find more information about its removal here: Implementation of Read-Only System Files and Mobile and I/O POST/GET Service Removal with RutOS 7.14
Best Regards,
Justinas