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allowed modes is not persistent (Update: only MBIM affected)

Hello,

i have two problems. The default mode in my case is: allowed: 2g, 3g, 4g; preferred: 2g So i successfully changed it using this command: mmcli -m 0 --set-allowed-modes='4g' New mode: allowed: 4g; preferred: none which is perfect for me.

Problem 1: after changing the mode, the connection is lost. The modem is in status: "state: registered" Only manual reconnect helps: mmcli -m 0 -b 0 -c

Problem 2: after a reboot, the setting is lost. The old default mode is active again: allowed: 2g, 3g, 4g; preferred: 2g

I'm using OpenWRT and tried it with different routers and different OpenWRT versions. I also tried different Modemmanager versions (1.16.6 and 1.18.6). The only commonality in all cases is the Modem: it's a Sierra Wireless MC7710.

Is this a bug? If i am not mistaken, this setting should be persistent... I have flashed the latest modem-firmware before testing (03.05.29.03). Also, i switched the modem firmware into MBIM mode (AT interface still available).

Do you need further informations?

BR, Giga-Pudding

Edited by Giga-Pudding
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