Printer not connected (Baudrate Marlin problem on BeePrint MKS WiFi)

Hi, I've installed a MKS Wifi on my Two Trees printer running Marlin on Robin Nano board. I've loaded Beeprint to my MKS Wifi and it was successful. I can open the pages, I did setup to my wifi and the interface is working fine. The problem I have is that when I open the browser it opens a popup at the bottom saying "Printer Connected", however in all widgets it says "NOT CONNECTED" and every command is disabled. Is there anything that needs to be done in the printer firmware to make it work? Thanks, Leonardo