I bought an unlocked Palm Pixi Plus; it's AT&T branded. I would like to update it to WebOS 2.x, and I can see there are a couple guides on this forum, but they're quite complicated and they don't specifically mention unlocked GSM models. I don't know how mine was unlocked, I bought it from Newegg, it's unlocked (I'm using it with Movistar in Argentina), and it's definitely the AT&T model (it has the logo on the front and it's got AT&T apps). I'm afraid to try and follow one of the guides, since I don't know if it'll stay unlocked after the update, if I can use a different carriers doctor, if I can use a CDMA doctor on a GSM phone...

Is it possible to update my phone? If so, could I be pointed to the easiest/best method to do so please?

Thank you