Virus embedded after root

Hello guys.

I'm fighting against a ZTE a460 by two days. Please help me!
I have tried a lot of ways to root this phone so I can remove bloatware by the carrier. The only app that root it was iRoot.
After the rooting the phone now shows ads even in the set up screen! Even when I did run TWRP and did the factory reset, when I enter android and set wifi the phone starts to show ads.
The app that show the ads is called SMSTool. I can use an antivirus to remove it from the phone, but I can't clean the ROM.
I am a "advanced user" so this is not a problem for me, but this phone will not stay with me. I will give it to a relative in some months.

Can I clean the ROM? I've read a lot about flashing a new ROM but people are saying that they can't use SIM functions after flashing, so the phone became a game, not a phone. If a root access can infect, a root access can clean, right?

How can I do that? Please! Help!!!

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