I am currently working with the Quectel EC200AAU module, firmware version EC200AAUHAR01A15M16_01.200.01.200
.
When I send USSD commands using AT+CUSD, the responses are returned in hexadecimal format (e.g., +CUSD: 2,"4D534953444E203A2033303435353438303135",244) instead of human-readable text, even after setting AT+CSCS="UCS2" or "GSM". This adds complexity as I must manually decode the responses in my application.
I would like to know if there is a newer firmware version available that properly returns USSD responses in readable text format, or if this issue has been addressed in any recent updates.
If so, could you please provide:
- The latest firmware for EC200AAU (preferably newer than EC200AAUHAR01A15M16_01.200.01.200
) - The upgrade tool and instructions