I have several of this Dollar Store/Tree Universal Remote that works pretty well but I also lost my codes. I was able to mess around with it and figure out how to make it scan for your device and thus not need the codes.
1. Hold the SET button down and push the desired device button (TV1, TV2, etc.) then release both buttons.
2. The red LED will come on solid. This is where you would typically enter the device code.
3. Now press the SET button once and the LED will start blinking indicating that the remote is in the "scan" mode.
4. Now start pressing the red Power Button. Each time you press it, it tries a different code. Keep repeating until the device comes on.
5. Once the device came on, the remote has the correct code. Press the device button again to lock it in.
That's all there is to it. Good Luck!