Since the links to the 1.9.3.6 firmware in the previous message (http://wl500g.info/showthread.php?t=1958) are dead, I'll give you the other links I found through searching the FTP directories for the wl-300g:

ftp://www.asus.com.tw/pub/asus/wirel...re_1937_EN.rar
http://www.asus.com.tw/pub/asus/wire...re_1937_EN.rar

Please note that you must not specify a user name to log in, as with the original firmware / the manual tells you to. Log in with no name and password 'admin'.

For me, the firmware upgrade (through the web interface) worked without problems on my WL-300g which still had old 'factory' firmware.
For the rest, I do not claim to know anything useful. Read the above thread for information. I don't even know if this 'apparently official' version is different from (better or worse than), or based on, "Olegs versions" that people are talking about. I just wanted to give the correct links.