mc8781 on sierra 881u

please help me,

I am using sierra 881u with built in gps,I try conect openAT via USB but when debug my tes APP,
AT+WOPEN always ERROR,can somebody help me?

Hi,

If I understand correctly, you tried to develope your OpenAT application for 881U USB modem.

If so, unfortunately, this product does not support OpenAT…

L