BC68 after at+nsost error

Hello. Working with BC68-GV. There is a problem. After sending AT+NSOST we receive AT+CME ERROR: 537. There is no description of this code in the manuals. Any ideas or description of what it can be?

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error537 is usually caused by short-time congestion on the radio network. It is recommended that you restart the device or re-register the network

Thank you for help. Can we get a link to the new manuals with these codes somewhere? It would make working with the modem much easier.

I have sent it to you,pls check,and I hope you can click the :yellow_heart: for me,thx

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Got the manuals. Tips are in. Thanks for your help!