just bought 1 set of SE W705. any suggestion on application could b installed into it?

Finally~ i bought this phone yesterday night,and it's amazing!!! i like it so much><  it's better than my k850 so much so much so much much mcuh~ woot~nice phone!! before buying it,i was scared it will like my k850...lag here lag there hang here hang there.....but it's not,i can while listening to the music and type sms smoothly~ ^^ and especially the Wifi function+Facebook app, the walkman player....^^    but....a thing that i do not like is.....the loud speaker...it is patheticT_T  the sound bad like hell== i cant believe that my k850 will louder and more nice than it.....hey man...w705 is walkman phone leh...how comes K series can win W series huh..==  but..it's ok...cause im seldom listen to the music using the loud speaker....almost using the headphone.....and the ClearAudioExp  is nice too^^  GoodPhone!
PS:can i know the latest firmware for this phone is?  mine is R1FA035...izzit the latest one?