Run sensors or cat /sys/class/hwmon/hwmon0/temp1_input .
Navigate to and switch from performance to schedutil or ondemand . This reduces voltage and frequency when idle, dropping temps by 10–15°C. w1700k openwrt hot
: If you need to "root" or unbrick the device, technical teardowns showing the UART pins can be found at Hung Vu's Tech Blog . Run sensors or cat /sys/class/hwmon/hwmon0/temp1_input