changing the default user-agent mag254

Greetings everybody.

I have mag 254 with Latest manufacturer firmware update and I have problem with streaming from
privet server, this server required user-agent as kind of authentication
so in the .m3u file I've added the user-agent as below

#EXTM3U
#EXTINF:-1 channel-id="1" tvg-id=""MB" tvg-logo="http://xxxxx.com/channels/MB.jpg" group-title="INT",MB
#EXTVLCOPT:http-user-agent=ZR+ V1.4.2
http://xxxxcom/ff.php?id=041&user=xxxx&pass=xxx&mac=90:26:ac:6e:55:b1

#EXTINF:-1 channel-id="2" tvg-id=""MB2" tvg-logo="http://xxxxx.com/channels/MB2.jpg" group-title="INT",MB2
#EXTVLCOPT:http-user-agent=ZR+ V1.4.2
http://xxxxcom/ff.php?id=041&user=xxxx&pass=xxx&mac=90:26:ac:6e:55:b1

and I've sniff the traffic using WireShark I've found that the user-agent something like "Lavf53.32.100\r\n" not as we want "ZR+ V1.4.2"
since I've test the same .m3u file in VLC found that the user-agent become "ZR+ V1.4.2" with no issue at all.

any suggest ?

thanks:?: