I want to setup firewall of Avast! Mobile Security in my Samsung Galaxy Y GT-S5360… I’ve already rooted my phone but after else it shows the message
“Your operating system kernel does not support nelfilter, so the avast! firewall will not work. To solve this, flash a custom ROM with full netfilter support.”
Like the message said, your going to have to install/flash a custom ROM on to your phone. Did you flash a custom recovery (CWM or TWRP) to your phone when you rooted it? If you did it should be pretty simple to flash a custom ROM to your device. I found a site that you can look at that explains what a ROM is and how to go about installing one for the Galaxy Y. It also has a list of popular ROMs for your device. As long as you follow the instructions closely you shouldn’t have a problem but always make sure to backup your important data before attempting to flash a ROM.