I tried to CTRtransfer 11.5 with GM9, but it doesn't get any better, still Failed to mount CTRNAND(luma)/Initialization: failed(Decrypt9).
One script that could fix this is Lazarus3DS, but I've no idea where to find the nand_hdr.bin, twln.bin, twlp.bin, sector0x96.bin, boot9strap.bin...