Help no 3g can't update

[daone3238]

i have a sprint lg marquee flashed to boost. ha and aaa secret have been written but i can't update my profile . each time i try it disconnects my internet. everything seems to be working find. it show 1x aslong as i dont try and update . i looked at my phones status and it says i'm on sprint network . this is driving me crazy. all my settings seem to be right except for it showing that its on sprint's network. this is so wierd. everything works but i do get 3g in some areas for likea secthen backdown to 1x.every now and then i get an error code 67 and it asks me to update . but as i said if i try and update the network shuts off. help plzzzzz and thank you