Is there any format spec for utp version 0?

[joe820912boy]

Now I check the utp_internal.cpp, it seems that there is only version 1 in it.
But today I want to identify utp protocol, and I know that mostly p2p client use utp version1 (?
and I google for version 0 format, in wireshark it mentioned the foramt https://github.com/wireshark/wireshark/blob/73ecb86f4cb3b1737765885d028f2083e06eef1e/epan/dissectors/packet-bt-utp.c#L64
but it didn't mention the flags in it, and I check the history of utp.cpp.
Maybe the flags combined of type and version (?
Is there anyone know the format of utp version 0 or any resource about it?