If the gateway previously worked in Home Assistant integration, you can enable Telnet on firmware 1.5.5:
5 clicks, pause, 2 clicks, pause, 2 clicks, pause, 2 clicks, pause, 2 clicks, pause, 2 clicks, pause, 2 clicks, pause. https://www.youtube.com/shorts/qJ21wWNE1Gg
Warning! Incorrect clicks can reset the gateway. 10 clicks - reset gateway.