Make sure the wireless connection is off. It may be easier to key in the codes when viewing the screen in landscape view. After entering in mepd, you may not see anything on the screen. Make sure that when you type in the 2 for mep2 using numeric input. When entered correctly, it should then prompt for the unlock code.
If you are using the keyboard input in "portrait view," you may have to use "meppd" and "mepp2." Take your time and make sure you hit the right key.
If you are using the keyboard input in "portrait view," you may have to use "meppd" and "mepp2." Take your time and make sure you hit the right key.