I'm using this S1:
{"svc-s1.bin", 0x020000, 0x70b44df1, 1}, // 1 Text data
and this descrambling code:
/* Descrambling S1 by FerchogtX, based on DorriGa's code */
unsigned char* srom = NeoTextROM+0x20000;
unsigned char* dst = (unsigned char*)malloc(0x20000);
memcpy( dst+0x00000, srom+0x10000, 0x10000 );
memcpy( dst+0x10000, srom+0x00000, 0x10000 );
memcpy( srom, dst, 0x20000 );
free(dst);