update router firmware Zyxel P-660HW-T1 v2

[dumble]

This is the message i get, when i upload the .bin file:

ERROR: FAIL TO UPDATE DUE TO... The uploaded file was not accepted by the router.

P-660HW Series: http://www.zyxel.com/web/product_family_detail.php?PC1indexflag=20040812093058&display=6241&CategoryGroupNo=AC5783AE-9475-41AD-BDA5-0997187F44AA

Firmware update i downloaded:

http://www.zyxel.com/web/support_download_detail.php?file=200604201611492006042016094620041105154230_20100625_3.40(APR.5)C0-340APR5C0.zip&model=P-660HW-T1%20v2

Anyone knows why this is not working? Because the model number is the same as on the back of my router: P-660HW-T1 V2

This is my current system status from the router.

Maybe it has something to do with a custom firmware from telefonica, chile. I am not sure.. I had a lot of dificulty to get into the router, until i found a website with the password i had to use to get in. Before that you had to configure the router with a very limited firmware on this address: http://192.168.1.1/WLAN.html. Looks like this:

But then i found out on this webpage you can get into the ´real´ firmware with this password: xel$7415708avlis

Can anyone help me?

Also tried in Internet Explorer, but it is not working: