Wi-Fi issues after flashing stock rom on Rogers S4

[FinalFury]

A few months ago I rooted my S4 and flashed Cyanogenmod as my custom rom. However, my S5 came in just 3 days ago and so I had to hand down my S4 to my mother. For whatever reason, she prefers touchwiz and hates the idea of a custom os, so she made me put touchwiz back. I did this by flashing a stock rom onto the phone, which I heard would also disable the root access. I followed the tutorial on rootmyandroid.com, using both the Odin and Rogers S4 firmware the tutorial provided, and the S4 was brought back to stock firmware. However, now my mom can't turn on Wi-Fi or Wi-Fi hotspot. Please help.

Thanks!