K810 --> W890

Ive heard that the k810 would not work properly with the w880 firmware. Some bugs with the nav joystick. and probably a few more bugs too.

But now that they have released the w890. would this firmware work better with the k810. Any known bugs?

If i deside to try it anyway. Could this kill my EROM?
And what w890 firmware should i choose?

(SE K810i, Unlocked/debranded. Sweden)

you can't do that because k810 is db2020 and w890 is db3150(A2). you cannot crossflash 2 phones from different platforms