I've not used Brawl+, but I suppose it's using a large code.
My recommendation is using USBLoader CFG instead of Uloader. Uloader is good, but doesn't allow you to use large ocarina codes. CFG does.
Also, you would need that gameconfig.txt file in the root
RSB?01:
codeliststart = 80570000
codelistend = 80580000
poke(800042B8, 60000000)
pokeifequal(80000000, 52534245, 803E9930, 60000000)
pokeifequal(80000000, 5253424A, 803E99A8, 60000000)
pokeifequal(80000000, 52534250, 803E9D5C, 60000000)
pokeifequal(80000000, 52534245, 801D5F60, 4800000C)
pokeifequal(80000000, 52534245, 80016C50, 60000000)
pokeifequal(80000000, 5253424A, 801D5FD8, 4800000C)
pokeifequal(80000000, 5253424A, 80016C50, 60000000)
pokeifequal(80000000, 52534250, 801D6740, 4800000C)
pokeifequal(80000000, 52534250, 80016CC4, 60000000)