EC25 lock on LIMSRV

IoT Modules LTE Standard Module
1

Hello, I am working on EC25 and on some modules we have a default : they lock on LIMSRV.
Same SIM card on two modules have not same response.

On good module connection is establish and AT commands return information
AT+GMR
AT+GMREC25EFAR06A04M4G
AT+CGSN
AT+CGSN866758044603617
AT+CIMI
AT+CIMI208990000000762
AT+QCCID
AT+QCCID+QCCID: 8933999395520007627F
AT+CGREG?
AT+CGREG?+CGREG: 0,1
AT+COPS?
AT+COPS?+COPS: 1,0,“208 99”,7
AT+QENG=“servingcell”
AT+QENG=“servingcell”+QENG: “servingcell”,“NOCONN”,“LTE”,“TDD”,208,99,19003,9,39150,40,3,3,3039,-126,-14,-95,-2,-

On bad module AT commands responses are
AT+GMR
EC25EFAR06A04M4G
AT+CGSN
866758044563126
AT+CIMI
208990000000762
AT+QCCID
+QCCID: 8933999395520007627F
AT+CGREG?
+CGREG: 0,0
AT+COPS?
+COPS: 1
AT+QENG=“servingcell”
+QENG: “servingcell”,“LIMSRV”,“LTE”,“TDD”,208,99,19003,9,39150,40,3,3,3039,-134,-19,-97,-7,5

before we have send commands to force APN and network identifier
CGDCONT=1,“IP”,“COMLOC”
AT+COPS=1,2,“20899”,7

Can someone help me here?

Thanks in advance for every reply.

Philippe

2

Hello phil_thales, thanks for your question
LIMSRV means your module fail to attach network, after observing the return of the AT+QENG command, I found that the current RSRP value of the module is very low. Please confirm whether your antenna is properly connected. You can try to re-plug the antenna and restart the module to see if it can be connected to the network, thank you.

3

Hello Duncan,

Antenna is correctly connected because with same module and another network module can connect.
On the network with problem, use another SIM card or restart the base station doesn’t change the result.
I try a better position to have higher RSRP value but result is same.

On another module with same problem, I find a solution : switch band to B3 and back to band B40. But for this module and some others this procedure doesn’t work.

Thank you for aid, Philippe

4

Hi there
If it still not work after use other working SIM card, we advise you check the module status. Please confirm whether you have changed the parameters of the module. You can follow the following AT command to check whether the parameters of the module are different from the modules that are normally registered on the network.
AT+CFUN? //Check the status of CFUN, 1 is normal, 0/4 is flight mode, 5 is factory mode or CEFS erasure, 7 is version mismatch or PA abnormal
AT+CPIN? //Check the status of the SIM card
AT+CGREG? //Check the registration status of the PS domain
AT+CREG? //Check the registration status of the CS domain
AT+QENG=“servingcell” //Check whether the module resides on the network
AT+COPS? //Check whether manual search for PLMN has been configured
AT+QCFG=“band” //Check whether the BAND configuration of the module has been modified
AT+QCFG=“nwscanmode” //Check whether the network search mode of the module has been modified
AT+QCFG=“nwscanmodeex” //Check whether the network search mode of the module has been modified
AT+QMBNCFG=“List” //Check if MBN activation does not match
AT+CGDCONT? //Check if the APN configuration is correct
If the parameters are the same but the network still cannot be registered, you can grab the abnormal log and send it to support@quectel.com
thank you