add: ds420+.

Author: foxis

blog/content/blog/bricked-ds420/asprogrammer.png

@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+import argparse
+import sys
+import os
+
+CHIP_SIZE = 16 * 1024 * 1024  # 16MB
+
+def main():
+    parser = argparse.ArgumentParser(
+        description='Extract BIOS from Synology PAT file and prepare for flashing'
+    )
+    parser.add_argument('-i', '--input', required=True, 
+                        help='Input bios.ROM from PAT file')
+    parser.add_argument('-o', '--output', default='flash.bin',
+                        help='Output file (16MB, default: flash.bin)')
+    args = parser.parse_args()
+
+    # Read input file
+    try:
+        with open(args.input, 'rb') as f:
+            data = f.read()
+    except IOError as e:
+        print(f"Error reading file: {e}")
+        sys.exit(1)
+
+    print(f"Input: {len(data)} bytes ({len(data)/(1024*1024):.2f} MB)\n")
+
+    # Find header signature
+    header_sig = b'$_IFLASH_BIOSIMG'
+    header_idx = data.find(header_sig)
+    if header_idx == -1:
+        print("Error: $_IFLASH_BIOSIMG signature not found")
+        sys.exit(1)
+    print(f"Found header at: 0x{header_idx:X}")
+
+    header_idx += len(header_sig)+8
+
+    # Find footer signature
+    footer_sig = b'$_IFLASH_INI_IMG'
+    footer_idx = data.find(footer_sig)
+    if footer_idx == -1:
+        print("Error: $_IFLASH_INI_IMG signature not found")
+        sys.exit(1)
+    print(f"Found footer at: 0x{footer_idx:X}")
+
+    # Extract BIOS data between signatures
+    bios_data = data[header_idx:footer_idx]
+    bios_size = len(bios_data)
+    print(f"\nExtracted BIOS: {bios_size} bytes ({bios_size/(1024*1024):.2f} MB)")
+
+    # Calculate padding
+    pad_size = CHIP_SIZE - bios_size
+    if pad_size < 0:
+        print(f"Error: BIOS too large ({bios_size} > {CHIP_SIZE})")
+        sys.exit(1)
+    print(f"Padding needed: {pad_size} bytes ({pad_size/(1024*1024):.2f} MB)")
+
+    # Show structure
+    print(f"\nStructure:")
+    print(f"  0x{0:08X} - 0x{bios_size-1:08X}: BIOS code")
+    print(f"  0x{bios_size:08X} - 0x{CHIP_SIZE-1:08X}: Zero padding")
+
+    # Write output: [BIOS] + [zeros]
+    try:
+        with open(args.output, 'wb') as f:
+            # Write BIOS data
+            f.write(bios_data)
+            
+            # Write zero padding
+            f.write(b'\x00' * pad_size)
+    except IOError as e:
+        print(f"Error writing file: {e}")
+        sys.exit(1)
+
+    print(f"\n✓ Created: {args.output} ({CHIP_SIZE} bytes)")
+    print("\nFlash with: CH341A + 1.8V adapter")
+    print("IMPORTANT: Leave pins 3(WP) and 7(HOLD) disconnected")
+
+if __name__ == '__main__':
+    main()