I have been trying to input a serial code for a Anniversary BG in one of my Moba games for almost 2hrs. Have been inputting [Eng] letters then switch to [jp] characters.

Then my sweet smart sister says:
"Did you use '0'(zero) or O? Cause the jp character says 'zero'"

Then changed the 'o' to zero...

It works!

I'm such an idiot. 😂