Huawei MU609 Application Manual page 146

HUAWEI MU609 HSPA LGA Module
Application Guide
The AT command "AT+IPR?" will return the baud rate, but the baud is not what the
host set or have no response by the UART.
The AT command "AT+CGDCONT?" will return the pdp profile, but the pdp profile will
be empty or not the same as that the host set.

Host Resume Steps
In this condition, the host need reconfigure the setting. We suggest the host configure
the setting after powering on the module.

Host Resume Example
Try to connect the module with the baud rates the module supports, and change the
baud rate that the host needs.
Run:
Response:
Issue 02 (2013-09-18)
AT+IPR=115200
OK
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Appendix
146