I have a VS-GWM400 firmware rev.2.4.6 and M35 gsm module frw.M35AR02A02.
The module remain in net req and registration denied,but the sim works correctly if inserted in another module or telephone.
This is AT log:
2018-05-16 10:02:45 TX:[AT+CREG=1]
2018-05-16 10:02:45 OK
2018-05-16 10:02:45 TX:[AT+CREG?]
2018-05-16 10:02:45 +CREG: 1,3
Hi, you can try use the auto-imei tools to change the imei of those ports. You can enable this tool by this url:http://your-ip-addr/cgi-bin/php/gsm-autoimei.php
If this still don't help you can add my skype:[email protected] and prepare Teamviewer for me.