ZTE F601 GPON Optical Converter

[teleportdark]

Hello, do anyone have any information about ZTE F601 optical changer with one internet port ? I don't know administrator password, I can't telnet to it,  I couldn't find how to restore these passwords, no original firmware found online, in general only very little info is available. Bruteforce is out of question, cause every 3 login window closes for 60s. I could guess simple user(no write access) name/password it's user/user . Please take a look at the screenshots I'm providing. Please give me some solution to this problem. Software version is : V1.0.0P1T8, boot loader : V1.0.0P1T8

http://www.aliexpress.com/item/ZTE-GPON-terminal-ZXA10-F601-FTTH-or-FTTO-GPON-ONU-With-one-ethernet-ports/530255731.html?tracelog=back_to_detail_a

So I can't set any rule,enable/disable with this simple user account.

BTW, do you notice how firewall protection is OFF by default ?

[relax]

have you tried all the usual standard passwords?
password
password123
pass
pass123
admin
admin123
expert03

[teleportdark]

Yes, ofcourse. I know it's changed by provider. And they don't want to tell me it! Sorry, Previous time I haven't attached screenshots. Here we go. Configuration like this(it's in bridge mode)