Loading the ELF into a disassembler (like IDA Pro), locating the specific function to change, and applying the "patch" (modifying the raw bytes).
For more information on getting started with Switch modifications, you can check community hubs like GBAtemp or the SwitchBrew Wiki . nx2elf patched
It fixes non-overlapping section headers to ensure "clean" loading in analysis tools. Loading the ELF into a disassembler (like IDA