If EvoX reports wrong flash type , then it sounds to me like you have a mod installed and haven't disabled it properly.
Read the tute on flashing the TSOP, I recommend you only flash the onboard TSOP using an enigmah to boot.
I have flashed quite a few onboards now and I always leave the 2 points linked for further upgrades. I have flashed mine 3 times now ! Its a great way to mod you box , better than open xbox in my opinion. If you read a lot and have half a brain you won't screw up and you'll enjoy a nice mod !