Always roaming after firmware update (I9000t on Cellular One MTPCS)

I have a I9000t on CellularOne (MTPCS). It's original firmware was I9000tubjg5. I updated to Darky's 9.0.3 and it worked great. However the Wifi would not work. So, I told it to do a factory reset, and this bricked it. So next I used Odin to put a stock 2.1 firmware on it from the XDA forums. This worked, but then I could not connect to CellularOne, only roaming with T-Mobile. I then tried Darky's 8.0, then stock 2.2, and now back on stock 2.1. Does anyone have an idea to fix it back to CellularOne(MTPCS)?

Please don't use the term brick so loosely.

Brick means what it implies your device is no better than a brick as in a paper weight to hold your paper from flying off. No Lights, no Screen, no response what so ever.

If you look at this  and scroll down just a little bit you will see
"WiFi not working properly?
Fix #1 >> http://bit.ly/gAqDAe
Fix #2 (WPA from v8.0 - No-Adhoc) >> http://bit.ly/darky-wpa-80"

Wikipedia states that the GT I9000T is the Mexican Variant exclusive to TelCel.

I am not sure what the exact difference is but I believe your problem has got to do with CSC.

Your best option is to get it reflashed by your carrier under warranty. Your Carrier's ROM will be hard to find out in the wild.

Peace.
IronSingh

Interesting. Glad it worked out for you.

Peace.
IronSingh