This router is widely used by spanish telecom company Jazztel. I've spent so time trying configure my JDownloader but at last i got it. This is my Script CLR:

<CryptLoad>
<Router name="COMTREND 5318" />
<Command method="Auth" action="" />
<Command method="GET" action="rebootinfo.cgi?sessionKey=1602970099">
</Command>
</CryptLoad>

Just configure your router IP, login and password in JDownloader and all goes ok.