Htc evo 3g not connecting after being flashed

[MrExclusive485]

How you doing, I didn't know where to upload this, its very important. I recently got and android phone (evo 4g sprint) and I flashed it to boost. The thing is I keep getting this error every two minutes (error 67) but my talk and text works perfect. My issues is the 3g not connected. The problem is I cant reflash it because I lost my donor phone (incognito boost mobile). I really need help and would really appreciate it!

P.s. When I go to prl update it also does not work...