ZBT WE-2806 problems

Hello everyone, I am a new user (from Argentina) and I've just found out about openwrt .. I have just received a WE-2806 router with two problems as I understand. The first one is that I cannot ping between devices on the same Lan. (with a legend reading: Destination Host Unreachable) I cannot see streaming rtmp from my encoder connected to the LAN. I even disabled firewall and created rules to open ports but nothing happened.
The second problem is a sudden reboot every 3 minutes.
I have not found a simple firmware to update this device. Can anybody help me please?
I am a bit lost.