I upgraded the firmware to the latest EG12EAPAR01A11M4G version. And found my internet became much slower. Maybe it is a coincidence that ISP broke something, but the same ISP in the phone has a great connection.
During investigating I found the B7 channel is not working, but restarting the modem will always help. After restart, the internet became a bit faster (because B7 is live now).
I suspect the problem is firmware. But how I can downgrade it to test?
RouterOS v7.2.3
Chateau LTE12
I am not sure if you can downgrade.
Also read here http://forum.mikrotik.com/t/downgrade-modem-to-r11e-lte6-v020/147122/1
It’s possible to downgrade, but you would need to host the modem firmware on a public http server or be using a version of RouterOS that allows firmware upgrade from file.
/interface/lte/firmware-upgrade lte1 upgrade=yes firmware-file="
The Quectel forums are full of Chateau LTE12 questions regarding the EG12-EA:
https://forums.quectel.com/c/iot-module/lte-a-module/35
Seems dongrade is possible. But how I could get a firmware version of EG12EAPAR01A10M4G? I checked the forum, but no firmware but complaints only.
Update_EG12EAPAR01A09-R01A06.zip is over here:
https://forum.ixbt.com/topic.cgi?id=14:66288-53
I’m not sure using firmware from strange sources is recommended though.
/interface/lte/firmware-upgrade lte1 upgrade=yes firmware-file="http://netfiles.ru/share/linked/ix/lte12/EG12EAPAR01A09M4G-EG12EAPAR01A06M4G.zip"