E3372s in non-HiLink mode

Hi,

trying to use a Huawei E3372s in modem mode, firmware 21.286.03.01.209. I’m not sure how to do it.

When setting it up as a 3G modem using ttyUSB1, I get in the logs:

Wed Jan 11 07:19:53 2017 daemon.notice netifd: Interface 'modem' is setting up now
Wed Jan 11 07:19:54 2017 daemon.notice pppd[17459]: pppd 2.4.7 started by root, uid 0
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: abort on (BUSY)
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: abort on (NO CARRIER)
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: abort on (ERROR)
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: report (CONNECT)
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: timeout set to 10 seconds
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: send (AT&F^M)
Wed Jan 11 07:19:55 2017 local2.info chat[17461]: expect (OK)
Wed Jan 11 07:20:05 2017 local2.info chat[17461]: alarm
Wed Jan 11 07:20:05 2017 local2.info chat[17461]: Failed
Wed Jan 11 07:20:06 2017 daemon.err pppd[17459]: Connect script failed
Wed Jan 11 07:20:07 2017 daemon.info pppd[17459]: Exit.

However, AT&F does work when entered manually in a terminal.

Also tried the often cited AT^NDISDUP=1,1,"web.vodafone.de". Afterwards I see a new tethering interface in the UI. But I cannot get an Internet connection, either.

What’s the right way?