Originally Posted by Madcap180
Question I have is.. What exactly does the IPL/SPL do? lol ..
IPL and SPL are your bootloaders.
They initialize and load your OS and radio. different versions have different commands available to them and in some cases a higher number means a better version. In others the higher number means there are security "fixes" that will make it harder for you to flash your phone.
For a Wizard I have seen no reason to update higher than the T-Mobile 2.26. But then again you should only do this if you have a G3. Flashing G3 bootloaders into a G4 device will irrevocably brick it.
I believe (don't quote me on this though) that only official carrier roms (newer than the G4 device) contain both G3 and G4 bootloaders and as such are safe to flash to a G4 device. I would confirm this with your carrier before doing so though.
Rom: Shogunmark Death v4.1
SuperCID with Pof unlocker V3
Rom: vp3G's v3.61 -- fat to phat rom