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, 0x00]

with open("PS4UPDATE.PUP", "rb") as f:

    v29 = byte_300.copy()
    v14 = 4919;

    while True:
        f.seek(v14)
        input = bytes(f.read(27))
        for i in range(27):
            v29[i] = (v29[i] ^ input[i])

        v14 += 4919
        if v14 == 24201480: # 4920 times
            break

    print("".join(chr(x) for x in v29))