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Step 1: This Is for 3500 Dpi Version(not 2013)
The products produced after 2013 may have some differences but it's similar at most parts
Step 2: Careful!
Be careful with ribbon wires. it's fragile and if you have broken these you must fix it with a
Step 3: That's It
Step 5: Then Let's Add LEDs
I don't know why they put so many holes here, but I like it.
Let the LEDs go though the hole beside the old blue LED. Don't forget to separate two pins of LED
If your new led's voltage is lower than then old led's which 2.7v. You must add a resistance. I used 1k resistance. You can change luminance by using different value of resistance.
Add the LED and the resistance into original circuit. Be careful with direction.
Step 9: The Final Step
Don't forget plug the header