I've started to customize my pre3. I have terminal access through navacom and I was able to change the transitioning boot images found here:
My Pre 3 is also ATT branded and I was able to change the carrier photo which is found here:
I notice when I restart my phone I now have the boot image and boot image bright I want to use. But when the phone first comes on there is a static HP image. Possibly a BIOS set image? Does anyone know where this is located and how I can update it?