Saiko Labs
A routine XORs the flag with a constant. Undo it.
Decompiled check. Flag bytes XOR'd with 0x66:
unsigned char enc[] = { 0x15, 0x07, 0x0f, 0x0d, 0x09, 0x1d, 0x16, 0x03, 0x03, 0x0a, 0x39, 0x12, 0x0e, 0x03, 0x39, 0x0d, 0x03, 0x14, 0x08, 0x03, 0x0a, 0x1b };