My ASUS Transformer TF700 worked fine and I did not put in any unlock code to open it. One day the initial screen showed a keypad and invited me to put in the unlock code. I read you can simultaneously push the power and volume buttons and do a "WIPE" that takes it back to Factory Default Settings. I have tried this repeatedly- holding for 5 - 20 seconds -since some postings indicate that 5 and 10 seconds bring different levels of "wipe." I have not had any luck with the ASUS Website.
I know this is pretty simple compared to all the "Super Geek" stuff I see on this site. However I can not even aspire to be a "Mediocre Geek" if I cannot unlock my tablet.