byte_300 = [0xCE, 0x55, 0x95, 0x4E, 0x38, 0x0C5, 0x89, 0x0A5, 0x1B, 0x6F, 0x5E, 0x25, 0x0D2, 0x1D, 0x2A, 0x2B, 0x5E, 0x7B, 0x39, 0x14, 0x8E, 0x0D0, 0x0F0, 0x0F8, 0x0F8, 0x0A5] BUFFER_LENGTH = len(byte_300) with open("PS4UPDATE.PUP", "rb") as f: v29 = byte_300.copy() v14 = 4919; while True: f.seek(v14) input = bytes(f.read(BUFFER_LENGTH)) for i in range(BUFFER_LENGTH): v29[i] = (v29[i] ^ input[i]) v14 += 4919 if v14 == 24201480: # 4919 times break print("".join(chr(x) for x in v29))