I'm still on stock firmware and have never used custom firmwares on routers before. Recently i found that i need to connect to my vpn directly through my router which isn't supported on stock firmware for rt-n56u. I know very little about what new functionalities I'd get from a custom firmware so i thought I'd ask here before flashing anything.
And if OpenWrt wouldn't give me a vpn client on the router, maybe some other custom firmware will that you could recommend.
Also, the stock firmware is from 2017, so is there any other benefit to using a newer custom firmware instead?