Nayab Basha Sayed upgraded the AT91Bootstrap bootloader to version 4.0.10 for v4-capable targets in the coolsnowwolf/immortalwrt repository, focusing on improving build reliability and hardware compatibility. The work involved updating the Makefile to pin the new bootloader version and mirror hash, ensuring that all relevant hardware consistently used the latest stable release. Leveraging expertise in build systems and embedded systems, Nayab validated the integration across affected devices to support reproducible builds. The project was implemented using Makefile and embedded development practices, with an emphasis on maintainability and stability, though the scope was limited to a single feature update.