Problem of the communication UART STEVAL-STMDLTE ( BG96) with nRF52840

[IOT Embedded System]

Hi,I work on a project, the objective is to communicate nRF52840 with ( STEVAL-STMODLTE , puce with modem BG96  steval-stmodlte ) .

the problem is that I don't receive the correct data from the modem .

I attached a screenshot of the data received . and yesterday i did a test, i communicated with a direct FTDI cable on the tx, rx, gnd of the modem and PC using a tool QUALCOMM QCOM to send AT command and i received the same incorrect data .

By info on the chip STEVAL-STMODLTE there is a usb port to send AT commands and it works well when you connect to the micro usb port, and also at the output of the chip i measure 3,3v and at the output of the modem BG96 i measure 1,8v because there is a shifter level in schematics  Link ( 8 . Schematic diagrams).

Concerning the baudrate, when I connect in usb micro, I send the command AT : AT+IPR? it responds well 115200 .

Thank you for your help , I'm stuck .

Best regards,