MC60 TCP data encoding

I am working on GSM OTA for ESP32. I am downloading firmware over tcp server but there is a problem with data. Bytes which has value higher than 0x72 appear as 0xFF. According to me it is an encoding issue, but i could not find any command to solve this issue,

Thank you in advance.

I’m sorry to reply you so late.
Could you please provide the detailed steps?

Hi eraytuncan I am attempting the same. Any luck on your side?