Article in English: Open your universal remote’s instruction manual and flip to the back. You’ll find a table of brand names and a list of corresponding codes. Once you find your brand, look at the list of devices and find your model’s unique code. Underline or mark the code in the manual to ensure that you can find it quickly in the future.  Common brands, like Samsung, Westinghouse, or LG, may have 20-30 codes listed under their brand. Mark your specific device so that you don’t have to spend a bunch of time searching for it in the future. On newer remotes and newer TVs, the list of available codes may pop up on your screen after you prompt it for programming with the device button. Older devices usually use 4-digit codes. Newer devices usually use 5-digit codes The device codes for universal remotes are listed online. If you don’t have access to your instruction manual or you aren’t sure where you put it, type your universal remote’s model number and “device codes” into an online search engine. You will find the codes for your remote online. The model number is listed on the back of your remote. Use the number pad on your remote to enter the corresponding 4 or 5-digit code for your device. Based on the model of your remote, the blue or red lights on your remote should turn off if you enter a valid code. If a code doesn’t work, you may not be able to enter a new code immediately. On most older remotes, you’ll need to go through the entire setup process again. If the blue or red light on your remote blinks once and then stays lit, your code is invalid but you can enter a new one.

Summary in Vietnamese:
Tìm mã 4 hoặc 5 số bằng cách tham khảo sách hướng dẫn. Bạn có thể tra cứu trên mạng nếu như không có sổ tay hướng dẫn của remote. Nhập mã bằng bàn phím số để thiết bị nhận dạng được remote.