You can see the uname output. We have ~100 rut955 routers in our fleet with different FW and we started seeing this problem around a month ago.
You can clearly see the garbage output from the uci command and it is also clear that those routers have different APN settings.
Here some more output from different routers using the same fw:
$ ssh root@10.10.0.52
root@10.10.0.52's password:
BusyBox v1.30.1 () built-in shell (ash)
____ _ ___ ____
| _ \ _ _| |_ / _ \/ ___|
| |_) | | | | __| | | \___ \
| _ <| |_| | |_| |_| |___) |
|_| \_\\__,_|\__|\___/|____/
---------------------------------
Teltonika RUT9 series 2020
---------------------------------
root@emil11_1107180326:~# uci show|grep apn
network.ppp.apn='www.internet.mtelia.dk'
simcard.sim1.pref_apn='wBшwBшwBѐwBѐwBјwBјwBѠwBѠwBѨwBѨwBѰwBѰwBѸwBѸwB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒▒wB▒'
simcard.sim1.auto_apn='0'
simcard.sim1.force_apn='-1'
simcard.sim1.apn='internet.telia.iot'
simcard.sim2.auto_apn='1'
root@emil11_1107180326:~# uname -a
Linux emil11_1107180326 3.18.44 #1 Wed Sep 30 10:11:52 UTC 2020 mips GNU/Linux
root@emil11_1107180326:~# gsmctl -A "AT+CGDCONT?"
+CGDCONT: 1,"IP","www.internet.mtelia.dk","0.0.0.0",0,0,0,0
root@emil11_1107180326:~# uname -a
Linux emil11_1107180326 3.18.44 #1 Wed Sep 30 10:11:52 UTC 2020 mips GNU/Linux
root@emil11_1107180326:~#
$ ssh root@10.10.0.56
root@10.10.0.56's password:
One working with the same FW:
BusyBox v1.30.1 () built-in shell (ash)
____ _ ___ ____
| _ \ _ _| |_ / _ \/ ___|
| |_) | | | | __| | | \___ \
| _ <| |_| | |_| |_| |___) |
|_| \_\\__,_|\__|\___/|____/
---------------------------------
Teltonika RUT9 series 2020
---------------------------------
root@emil9_1107172410:~# gsmctl -A "AT+CGDCONT?"
+CGDCONT: 1,"IP","internet.telia.iot","0.0.0.0",0,0,0,0
root@emil9_1107172410:~# uname -a
Linux emil9_1107172410 3.18.44 #1 Wed Sep 30 10:11:52 UTC 2020 mips GNU/Linux
root@emil9_1107172410:~#