Cleans and prepares a Nintendo DS firmware dump for No-Intro

fw.py

import sys, binascii
from datetime import datetime

with open(sys.argv[1], 'rb') as f:
    data = f.read()

data_hex = data.hex()
date = data_hex[0x18*2:0x18*2+10] # BCD encoded
try:
    date_dt = datetime.strptime(date, '%M%H%d%m%y')
    date_str = date_dt.strftime("%Y-%m-%d %H:%M")
except ValueError:
    date_str = date

console_type = {
    'ff': 'Nintendo DS',
    '20': 'Nintendo DS Lite',
    '43': 'iQue DS',
    '63': 'iQue DS Lite',
    '35': 'Nintendo DS Lite (Korea)',
    '00': 'Prototype?',
    '01': 'Nintendo Zone Box'
}
console = data_hex[0x1D*2:0x1D*2+2]
try:
    console_t = console_type[console]
except KeyError:
    console_t = 'Unknown'

print(f'Build timestamp: {date_str}')
print(f'Console: {console_t}')

with open('cleaned.bin', 'wb') as f:
    f.write(data[:0x2A])
    f.write(binascii.unhexlify('FF'*0x1D6))
    f.write(data[0x200:-0x600])
    f.write(binascii.unhexlify('00'*0x400))
    user_settings = '05' + '00'*0x6F
    for i in range(2):
        if console == '35': # lite korean
            usr_set = user_settings + f'0{i}00454F' + '0101AF00' + 'FF'*0x86 + 'BC25'
        elif console == '63': # lite ique
            usr_set = user_settings + f'0{i}00454F' + '01017E00' + '00'*0x86 + '5494'
        elif console == '43': # phat ique
            usr_set = user_settings + f'0{i}00454F' + '01017E00' + 'FF'*0x86 + 'E510'
        else:
            usr_set = user_settings + f'0{i}00454F' + 'FF'*0x8C
        f.write(binascii.unhexlify(usr_set))

print("Cleaned Wi-Fi calibration, Wi-Fi access points, user settings in cleaned.bin")

with open('WifiCalibration.bin', 'wb') as f:
    f.write(data[0x2A:0x200])
with open('WifiAccessPoints.bin', 'wb') as f:
    f.write(data[-0x600:-0x200])
with open('UserSettings.bin', 'wb') as f:
    f.write(data[-0x200:])