During March 2025, this developer focused on stabilizing multi-core boot processes in the flipperdevices/u-boot repository by addressing a critical issue in ARMv8 systems. They implemented PSCI vector initialization for subordinate CPUs in Assembly, ensuring that when PSCI is configured and XPL is not built, all cores—not just the manager CPU—correctly set up their vectors. This low-level programming work improved trap handling from higher exception levels and reduced boot-time failures in embedded systems. The solution demonstrated a deep understanding of ARM architecture and system governance, providing a robust fix that aligned subordinate CPU behavior with established boot protocols.