Hybrid STB JHS D200 v2
Are you talking about this reset button?
Image 1
View attachment 943
btw there are some points 4 alinged in line for communication GND, TX RX & 3.3V power, maybe someone which hardware skills could test it too
Just for information in FireTV Sticks required to short the pins to enable boot, similarly did you try to short the pin, while plugged in? as far i know in firetv it was on of the legs in emmc/boot and ground, pretty sure it should be same here but it could also bring the risk of bricking the device.
i have not tried it, as long ago i had file manager installed using which i am still able to backup files and also install updates of ThopTV etc.
Image 2
View attachment 946