I think that with stock firmware it is not possible. I flashed pure OpenWRT v23 but still no luck. The modem is visible in mmcli but SIM card will not register.
I followed this tutorial. Apparently prepering the modem is also necessary see this but I don’t want to do it.
It’s already my second modem that I can not connect. I sold L-860 because it didn’t work with stock firmware. I though I will have more luck with DW5821e but it doesn’t look like this.
A couple days ago I bought another L-860 (in shipping) and going to sell DW5821e. Hope it will connect via OpenWRT v23.

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