Once u root your phone, I believe u cannot update via OTA... It will always tell u that its up to date... Moreover Kies won't work either....
Your best bet is to download the latest firmware and flash it thru CWM or Odin...
Sent from my GT-I9500 (Hassan Khalid Malik) using Tapatalk 2
Hassan Khalid Malik
★★★OMEGA ROM Team Member★★★
Samsung Galaxy S4 I-9500 ● Omega Rom 23, Perseus 19.1 Alpha, Philz Touch Recovery 6, Xposed Framework & Custom (CPU) init.d Script / Audio w/DSP init.d Script ●
Samsung Galaxy S3 I-9300 ● Omega Rom 59, Boeffla-Kernel 5.3, Philz Touch Recovery 6, Xposed Framework & Custom (Audio w/DSP) init.d Script ●