For those of you 9550 owners that are eager for 5.0.0.436 - you can copy the Java folder from the 9250 .436 release into the 9550 .428 folder and replace its current Java folder. It will work fine - the only difference is the .428 radio file as opposed to a .436 but this will update all of the applications and core files to .436.
I tried it and it works flawless!