R4i Best Firmware?

I have a r4i ultra and I'm sure I don't have even the best firmware on it. Does wood firmware work on it? If so whats the best wood firmware? If not whats the best firmware that is supported? ThanksThis is what it is >>

http://www.linfoxdomain.com/nintendo/ds/dl.php/R4Ultra_v1.55_English.rarThat is the latest official (direct download link). You can try WAIO (Wood-All-In-One), but I don't know if it will work. I'll give you the link to the GBAtemp page with all the info and downloads and such so you can see for yourself.http://gbatemp.net/t237398-waio-woodallinone