Help!

[chadtic]

I bought a used htc ppc6800. It was originally a Sprint phone. It is supposedly unlocked and ready to be flashed to any carrier other than Sprint. The seller said the phone had a bad ESN and wouldn't be able to be used on Sprint network in the US. I use a local rural Oklahoma carrier called Pioneer Wireless. They have the HTC ppc6800 in stock, but said the get them straight from HTC with a generic load so the phone will take their Pioneer Wireless settings, but they have no software capabilities to get my phone back to these settings. Is there anything I can do to g! et the phone I purchased back to the original load generic htc setting s, so I will be able to use my local network?