its the one i have, and i am very happy with it so no need to even change it for me.
but one way to update it is to pull the battery and SIM and boot the phone without the SIM card. then pull battery, replace sim and battery and boot again. it should update then. keep in mind, an updated PRL doesn't mean better. i have seen a few people that have wanted to revert back to the 15109 after an update.....and i just dont even know if that is possible, let alone how to do it.