Script for picking up drone's code in Infamous Second Son Paper Trail mission (https://infamouspapertrail.com/dupmodified_trackerdrone)

bruteforce.js

(function() {
	var code = [],
		length = 6,
		exeptions = {},
		shuffle = {},
		freeze = {};

	function generate() {
		for (var i = 0; i < length; i++) {
			var digit = Math.floor(Math.random() * length),
				usedShaffledDigit = false,
				skip = false;

			if (freeze[i]) {
				continue;
			}

			for (var shuffledDigit in shuffle) {
				if (!shuffle[shuffledDigit][i]) {
					digit = shuffledDigit;
					usedShaffledDigit = true;
					break;
				} else if (shuffledDigit == digit) {
					skip = true;
					break;
				}
			}

			if (skip) {
				i--;
				continue;
			}

			if (exeptions[i] && exeptions[i][digit]) {
				if (usedShaffledDigit) {
					shuffle[shuffledDigit][i] = true;
				}
				i--;
				continue;
			}

			code[i] = digit;
		}
	}

	function check() {
		$.get('/pages/guessdiff', {
			guess: code.join('')
		}).done(function(response) {
			if (response.solved) {
				console.info('Succeed attempt! Code: ' + code.join('') + ' Attempts left: ' + response.remaining);
			} else {
				var diffArr = response.diff.split('');

				console.log('Failed attempt! Code: ' + code.join('') + ' Diff: ' + response.diff + ' Attempts left: ' + response.remaining);

				for (var i = 0, length = diffArr.length; i < length; i++) {
					switch(diffArr[i]) {
						case '0':
						case '1':
							if (!exeptions[i]) {
								exeptions[i] = {};
							}
							exeptions[i][code[i]] = true;

							if (diffArr[i] == 1) {
								if (!shuffle[code[i]]) {
									shuffle[code[i]] = {};
								}
								shuffle[code[i]][i] = true;    
							}
							break;
						case '2':
							freeze[i] = true;
							break;
					}
				}
				if (!response.remaining) {
					exeptions = {};
					shuffle = {};
					freeze = {};
					console.log('-----');
				}
				tryAgain();
			}
		});
	}

	function tryAgain() {
		generate();
		check();
	}

	tryAgain();
})();

Open page https://infamouspapertrail.com/dupmodified_trackerdrone, then open web developer console (Cmd/Ctrl + Shift + I), paste this code and execute. It will start to pick up correct code and after finishing you will just need to update page.

P.S. Bruteforcing may take time but you can see progress in browser console

could your code be altered to use charcacters instead of numbers??