The newest is 5.50 GEN-B, however, it has very poor HB support. If you're going for good HB support, you should go for 5.00 M33-6, by Dark_Alex. There are tons of tutorials about upgrading to it, take a look at them!
And please note that due to the limitations of the 5.50 GEN-B, you cannot use HellCat's recovery flasher to go back to eariler fws, and Despretar(i hope i spell it right) del Cementrio doesn't work either. You'll need a pandora battery and a magic memstick
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