Prompt [Q] gt-i9305 screen mirroring issue

Hi guys

Ive recently flashed official android 4.3 to my galaxy s3 gt-i9305 and rooted it, I have now found out that i am unable to connect to a miracast box ive bought, the phone is telling me that there is a hardware issue, I understand through the forums that this could be because its rooted? Does anyone know of a fix to amend this issue yet still keeping root access!?

Thanks guys, hope someone can help, i'd really appreciate it