Worked on hardware stability and firmware-level improvements for ImmortalWRT, focusing on Mediatek-based Sinovoip BPI-R3 boards. Addressed a bug in PWM fan control by tuning device-tree cooling-levels, optimizing fan speed for medium CPU activity and improving thermal management. Used device tree configuration and Linux kernel debugging to adjust cooling parameters from <255 96 0> to <255 40 0>, reducing the risk of thermal throttling under current firmware. All changes were contributed to the coolsnowwolf/immortalwrt repository, with disciplined git patching practices ensuring a clean patch history and easier long-term maintenance for embedded systems deployments.