Carrier Issues Unlock Phone.

Dear Members,

I have a issues with my unlocked LG G3 D855, i got it from a carrier called Orange, and i´m using it in another carrier called Claro, my problem came when i sent it to fix some problem to the original carrier, they made a software upgrade and now my phone doesn't get LTE signal (Just get 4G) and in the stock browser my homepage belong to the original carrier, even when i made a full restart and re installed a new rom.
Both companies have same phone model and use same band to get LTE in the LG G3.

Thanks