Worked on the flipperdevices/u-boot repository to enhance MMC boot compatibility for ZynqMP boards by updating how the boot sequence environment variable is stored. The solution involved replacing the use of env_set_hex with env_set_ulong, ensuring that the bootseq variable is now saved in decimal format as expected by U-Boot MMC commands. This adjustment reduces boot-time errors and streamlines boot script maintenance. The work was implemented in C, leveraging expertise in embedded systems and environment variable management. The change was well-scoped, low risk, and directly traceable, providing clear business value and improving maintainability without introducing new bugs.