Hey, I set different RATs before and don't encounter this issue. you can set RAT via " qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-preference='umts|lte' ", then unplug and plugin the modem. continue to issue command to connect modem. As for your issue that the modem refuses to connect, I think maybe the modem can't work on umts or lte mode. you can plugin the modem on PC to check which mode it can work on in your position. then back to test the modem At 2014-11-04 13:55:49, "Gopakumar Choorakkot Edakkunni" <gopakumar.c.e@gmail.com> wrote: <blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><div dir="ltr"><div>All, So I wanted to disable my modem from trying to connect to 2G because I saw some threads that says that Sierra modem firmware conks at times when they try to connect to 2G. I have a Sierra AC314U modem. So I said qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-preference='umts|lte' - basically saying that use only 3G and LTE. After that point the modem goes back to "Ready to connect" state. Now I try using - qmicli -d /dev/cdc-wdm0 --wds-start-network=broadband --client-no-release-cid to initiate the connection (which is what I usually use to connect and it works). But after that point the modem refuses to connect even though the --nas-get-system-info option shows available 3G/LTE networks. So I suspected that its because the nas-set-system-selection-preference says that a modem reset is needed, and I did not reset the modem. So I forced a reset using the below pair of commands, but after the reset the umts|lte selection I made is thrown out and its back to gsm|umts lte. So thats a chicken and egg problem. qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=offline qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=reset </div>So my question is: If the "--nas-set-system-selection-preference='umts|lte'" needs a reset and the setting is wiped out after a reset, how exactly do I do that ? Any guidance will be appreciated! Rgds, Gopa. </div> </blockquote>