@w660
Flashing your phone with a walkman firmware would function properly but you won't get any network.
@Benyboy3
You cannot possibly extract the walkman and flash it to K800i. What i have done is, i installed KD Player along with the best possible walkman skin. Then i made the right button (Menu button) into a walkman button and linked it to KD Player. Now when i press the right button it fires up the walkman (not exactly, but KD Player is way better in many functions).
Try it.
Here is the link to the file you need for the walkman button :
RIGHT_SOFTKEY_HOOK.itm - Top Sony Forums
Dont forget to press the thanks button :D