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4G-AC68u Update modem firmware

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could anyone advice how to update a modem firmware on 4G-Ac68u? Manual refers to corresponding section in the UI, however on my router, with a current firmware instead of section for modem firmware I see section for AIMesh nodes. Maybe some terminal command?

Don't worry about the 4G modem side, the carriers will push OTA updates for the modem if needed...
could anyone advice how to update a modem firmware on 4G-Ac68u?

There is no separate modem firmware update. When needed it's included in firmware file.

There is separate modem firmware on the support site, latest I see ASUS 4G-AC86U Modem Firmware version A21_02_001. Inside archive there is a set of files , with different extensions (
mbn, xml, ubi, etc) . Fixed disconnection issue from incomplete packet error of base station side on several ISP and made 4G-AC86U more resilient.

On router UI I see modem software version WWHC050_EU.D61.04.A04,which seems to be quite outdated.

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