However, the V5 hardware has limitations; it typically features low flash and RAM (often 4MB Flash / 32MB RAM), which can make running the latest, full-featured versions of OpenWrt challenging. Flashing custom firmware often requires specific methods like TFTP recovery mode rather than the standard web interface. Download for TL-MR3420 V5 - TP-Link
TP-Link’s official firmware focuses on stability and plug-and-play compatibility for 3G/4G USB modems. Does TP-Link MR3420 V5 have Gargoyle Firmware? tplink mr3420 v5 firmware