Tplink Mr3420 V5 Firmware _top_ -

As of OpenWrt 23.05+, the MR3420 v5 is officially supported in the master branch due to incomplete MediaTek MT7628 driver integration for the 4G LTE USB failover switching logic.

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: Users have reported occasional Wi-Fi drops and limited compatibility with unbranded or newer 3G/4G USB modems. Third-Party Firmware Options tplink mr3420 v5 firmware