There are four indicators on the EZR33L router. From up to down, the left sides are system & Wi-Fi, and the right side is SIM1 & SIM2. Below are the indicator descriptions.
This light indicates that the router is receiving power. If it's lit solid green, then the router has booted successfully.
The router system is booting up. The system indicator flashes while resetting or flashing the firmware.
No light at all indicates that the router is not receiving power. Check the PoE socket connect to the motherboard and check the PoE adapter. You might need to test an alternate power socket if the router doesn't power on.
This light indicates that the modem is sending a Wi-Fi signal. If the light is on the green, you can see and connect to the Wi-Fi network.
If you are connected to the Wi-Fi hotspot, it will flash green to indicate data going to and from the router. If the router is connected to another Wi-Fi hotspot (Wi-Fi relay), it will also flash because it has the data flow.
If it's off, your router is no longer sending a Wi-Fi signal. You can log in to the router admin and turn on the Wi-Fi master hotspot.
These lights indicate the router is using which SIM card. It uses the SIM1 by default. You can change to use SIM2 on the router admin.
Close the Enclosure
Close the lid & press it with your hand.
Then use the hexagon end on T-wrench to tighten four pieces of bolts on the lid.
After closing the enclosure, please review and ensure no gap after tightening the screws!