diff --git a/gcd_old.py b/gcd_old.py
deleted file mode 100644
index a480de3..0000000
--- a/gcd_old.py
+++ /dev/null
@@ -1,175 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-
-# Thanks to TurboCCC and kunix for all your work!
-
-GCD_SIG = b"GARMINd\00"
-
-from binascii import hexlify
-from struct import unpack
-from grmn import ChkSum, devices
-import sys
-
-FILE = sys.argv[1]
-
-TLV_TYPES = {
-    0x0001: "Checksum remainder",
-    0x0002: "Skip?",
-    0x0003: "Part number",
-    0x0005: "Copyright notice",
-    0x0006: "Block Type 7 format definition",
-    0x0007: "Binary descriptor",
-    0x0008: "Binary Region 0C (boot.bin)",
-    0x0401: "Binary Component Firmware (SensorHub, ANT_BLE_BT, GPS, WiFi)",
-    0x0505: "Binary Region 05",
-    0x0555: "Binary Region 55",
-    0x0557: "Binary Region 57",
-    0x02bd: "Binary Region 0E (fw_all.bin)",
-    0xffff: "EOF marker",
-}
-
-cksum = ChkSum()
-all_cksum_ok = True
-last_type6_fids = []
-last_type6_format = ""
-last_type6_fields = []
-
-def get_tlv_comment(ttype):
-    if ttype in TLV_TYPES:
-        return TLV_TYPES[ttype]
-    else:
-        return "Type {:04x} / {:d}".format(ttype, ttype)
-
-print("Opening {}".format(FILE))
-
-def parseTLVheader(hdr):
-    (ttype, tlen) = unpack("<HH", hdr)
-    return (ttype, tlen)
-
-def parseTLV1(payload):
-    global cksum, all_cksum_ok
-    if len(payload) != 1:
-        print("  ! Checksum has invalid length!")
-        all_cksum_ok = False
-    expected = cksum.get()
-    payload = unpack("B", payload)[0]
-    state = "INVALID!"
-    if expected == payload:
-        state = "valid."
-    else:
-        all_cksum_ok = False
-    print("  - Checksum expected: {:02x} / found: {:02x} - {}".format(expected, payload, state))
-
-def parseTLV3(payload):
-    # Part number?
-    # 10 d4 5c 13 04 45 0d 14 41  - GPSMAP6x0_370
-    # 10 d4 5c 13 04 45 0d 14 41  - fenix5Plus_SensorHub_220
-    # 10 d4 5c 13 04 45 0d 14 41  - fenix_D2_tactix_500
-    # 10 d4 5c 13 04 45 0d 14 41  - fenix5_1100
-    # 10 d4 5c 13 04 45 0d 14 41  - fenix5Plus_420_rollback
-    # 10 d4 5c 13 04 45 0d 14 41  - fenix5Plus_420
-    # 10 d4 5c 13 04 45 0d 14 41  - fenix5Plus_510
-    # 10 d4 5c 13 04 45 0d 14 41  - D2Delta_300
-    print("  > " + " ".join("{:02x}".format(c) for c in payload))
-    #print(hexlify(payload).decode("utf-8"))
-    print("  > " + repr(payload))
-
-def parseTLV6(payload):
-    global last_type6_format, last_type6_fields, last_type6_fids
-    # Describes following TLV7:
-    # http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=137838&whichpage=12
-    # First nibble might be data type: 0 = B, 1 = H, 2 = L
-    FIELD_TYPES = {
-        0x000a: ["B", "XOR flag/value"],
-        0x000b: ["B", "Reset/Downgrade flag"],
-        0x1009: ["H", "Device hw_id"],
-        0x100a: ["H", "Block type"],
-        0x100d: ["H", "Firmware version"],
-        0x1014: ["H", "Field 1014"],
-        0x1015: ["H", "Field 1015"],
-        0x1016: ["H", "Field 1016 (WiFi fw)"],
-        0x2015: ["L", "Block size"],
-        0x5003: ["", "End of definition marker"],
-    }
-    if len(payload) % 2 != 0:
-        print("  ! Invalid payload length!")
-    
-    last_type6_fids = []
-    last_type6_format = ""
-    last_type6_fields = []
-
-    for i in range(0, len(payload), 2):
-        fid = unpack("H", payload[i:i+2])[0]
-        fdef = FIELD_TYPES[fid]
-        print("  - {:04x}: {}".format(fid, fdef[1]))
-        last_type6_fids.append(fid)
-        last_type6_format += fdef[0]
-        last_type6_fields.append(fdef[1])
-
-def parseTLV7(payload):
-    global last_type6_format, last_type6_fields, last_type6_fids
-    values = unpack("<" + last_type6_format, payload)
-    for i, v in enumerate(values):
-        fid = last_type6_fids[i]
-        fdesc = last_type6_fields[i]
-        if fid == 0x1009:
-            print("  - {:>20}: 0x{:04x} / {:d} ({})".format(fdesc, v, v, devices.DEVICES.get(v, "Unknown device")))
-        elif fid == 0x2015:
-            print("  - {:>20}: {} Bytes".format(fdesc, v))
-        else:
-            print("  - {:>20}: 0x{:04x} / {:d}".format(fdesc, v, v))
-
-with open(FILE, "rb") as f:
-    sig = f.read(8)
-    cksum.add(sig)
-    if sig == GCD_SIG:
-        print("Signature ok.")
-    else:
-        raise Exception("Signature mismatch ({}, should be {})!".format(repr(sig), repr(GCD_SIG)))
-
-    i = 0
-    fw_all_done = False
-    cur_ttype = None
-
-    while True:
-        hdr = f.read(4)
-        cksum.add(hdr)
-        (ttype, tlen) = parseTLVheader(hdr)
-        print("#{:04} TLV type {:04x} (offset 0x{:x}, length {} Bytes) - {}".format(i, ttype, f.tell(), tlen, get_tlv_comment(ttype)))
-        if ttype == 0xFFFF:
-            print("End of file reached.")
-            break
-        payload = f.read(tlen)
-        if ttype == 0x0001:
-            parseTLV1(payload)
-        elif ttype == 0x0003:
-            parseTLV3(payload)
-        elif ttype == 0x0006:
-            parseTLV6(payload)
-        elif ttype == 0x0007:
-            parseTLV7(payload)
-        elif ttype == 0x02bd and not fw_all_done:
-            hw_id = unpack("H", payload[0x208:0x20a])[0]
-            fw_ver = unpack("H", payload[0x20c:0x20e])[0]
-            print("  - Device ID: {:04x} / {:d} ({})".format(hw_id, hw_id, devices.DEVICES.get(hw_id, "Unknown device")))
-            print("  - Firmware version: {:04x} / {:d}".format(fw_ver, fw_ver))
-            fw_all_done = True
-        else:
-            payloadshort = payload[:64]
-            #print("  > " + " ".join("{:02x}".format(c) for c in payloadshort))
-            #print(hexlify(payload).decode("utf-8"))
-            #print("  > " + repr(payloadshort))
-        cksum.add(payload)
-        if ttype in [0x0008, 0x0401, 0x0505, 0x0555, 0x0557, 0x02bd]:
-            outname = "{}_{:04x}.bin".format(FILE, ttype)
-            if ttype != cur_ttype:
-                mode = "wb"
-            else:
-                mode = "ab"
-            cur_ttype = ttype
-            with open(outname, mode) as of:
-                of.write(payload)
-        i = i + 1
-
-if not all_cksum_ok:
-    print("There were problems with at least one checksum!")