is it possible to bypass cookie protection to perform a CSRF on HUAWEI HG531 v1 router?

the AJAX login script

var xhr1 = new XMLHttpRequest();     xhr1.open("post", 'https://192.168.1.1/index/login.cgi', false); xhr1.send("Username=admin&Password=6836394be82df057e085fc344c6179d1b50b30224ad0SJ0GQrNWmpsXCSk5so7o73f93282&challange=SJ0GQrNWmpsXCSk5so7o"); 

the problem is it gives me this error

Login Failure: Browser did not support Cookie. Please enable Cookie

and i can’t send a cookie header cause it’s a Forbidden header name ….. the page after i press login it sets the required cookies to perform a login . is there any way around this ?

some lines from the page source code that i think are important

var strCookie = document.cookie;  document.cookie = cookie;  var cookie = "Language=en" + expires + ";  var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$  )' );