From 0f593a17078f680a8f7659b0725efef31ecc95b5 Mon Sep 17 00:00:00 2001
From: Triss <sys64738@www.librepunk.club>
Date: Sat, 24 May 2025 01:02:27 +0200
Subject: [PATCH] add python script to change device type in FTDI config EEPROM

---
 change_device_type.py | 62 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 change_device_type.py

diff --git a/change_device_type.py b/change_device_type.py
new file mode 100644
index 0000000..8e2c294
--- /dev/null
+++ b/change_device_type.py
@@ -0,0 +1,62 @@
+
+import base64, pyftdi, sys, usb
+from pyftdi.eeprom import FtdiEeprom
+from pyftdi.misc import hexdump
+
+
+DEFAULT_CONFIG = base64.b64decode(b"AAADBNB/ABCAyAgAAACgErIe0BwAAAAAAAAAAAAAAAAEAAAAYqd+A5/19nT0AQAAAAAAAAAAAAAAAAAAAAAAAIiIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABWNqnJAQBqbK2IMAAAAAAAAAAAAURPUUE0RTAxAAAAABIDSQBLAEEATABPAEcASQBDAB4DUwBjAGEA\
+bgBhAFEAdQBhAGQAIABTAFEANQAwABwDMQAwADAAMwAwADUAMAAwADAANQA0ADgAMgAAAAAAAAAAAAAAAAAAAAAAAABqPg==")
+
+
+def main(args):
+    dev = usb.core.find(idVendor=int(args.vendor,0), idProduct=int(args.product,0))
+    if dev is None:
+        print("ERROR: Device not found!", file=sys.stderr)
+        exit(1)
+
+    eeprom = FtdiEeprom()
+    try:
+        eeprom.open(dev)
+        eeprom.dump_config()
+
+        if args.backup is not None:
+            args.backup.write(eeprom.data)
+            return
+        elif args.variant is None:
+            print("ERROR: must select a variant!")
+            exit(1)
+
+        if args.init_with_default:
+            eeprom.data = DEFAULT_CONFIG
+            eeprom.set_serial_number("1003%03d0%06d" % (args.variant, random.randint(0,1000000)))
+        else:
+            eeprom.set_product_name("ScanaQuad SQ%d" % args.variant)
+            if args.randomize_serial:
+                eeprom.set_serial_number("1003%03d0%06d" % (args.variant, random.randint(0,1000000)))
+            else:
+                eeprom.set_serial_number(eeprom.serial[:4] + ("%03d"%args.variant) + eeprom.serial[6:])
+
+        eeprom.commit(dry_run=args.dry_run)
+        print(hexdump(eeprom.data))
+        eeprom.dump_config()
+    finally:
+        eeprom.close()
+
+
+if __name__ == '__main__':
+    import argparse
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--vendor', default="0x0403", help="USB vendor ID")
+    parser.add_argument('--product', default="0x7fd0", help="USB product ID")
+
+    grp = parser.add_mutually_exclusive_group(required=True)
+    grp.add_argument('--backup', type=argparse.FileType('wb'), default=None, help="Back up the existing config (on the device) to this path. Inhibits any further actions of writing the EEPROM.")
+    grp.add_argument('--variant', choices=[50,100,200], type=int, help="Variant to configure the device as")
+
+    parser.add_argument('--init-with-default', default=False, action='store_true', help="Initialize entire EEPROM with default values (implies --randomize-serial, default off) (CAN BE DANGEROUS! USE ONLY FOR UNBRICKING!)")
+    parser.add_argument('--randomize-serial', default=False, action='store_true', help="Randomize the device's serial number (default off)")
+    parser.add_argument('--dry-run', dest='dry_run', default=True, action='store_true', help="Print result of action instead of actually writing to device (default on).")
+    parser.add_argument('--no-dry-run', '--commit', dest='dry_run', default=True, action='store_false', help="Actually write to device (default is to dry run) (CAN BE DANGEROUS!)")
+    args = parser.parse_args()
+    main(args)