@TungChan It seems to be the fault of the size of the firmware memory. And the switch chip is also different and disabled.

@TungChan Hardware Version: TL-ER6120G v2.0 Firmware Version: 2.0.4 Build 20200313 Rel.56019 Octeon evb7000_sff(ram)# reset Enable the external watchdog to reboot! Reset Flash0/Flash1 SPI stage 1...

ER6120(G) V2 FW1 updated the wrong firmware with ER6120(UN) V2 FW2. And now the WAN port is not functioning. I can login web page but cannot update any firmware again. I can see console interface but...