Hi, thanks for using JustAnswer.com I am Cris.
Is this the password ***** login into the device? Which Kindle do you have Kindle Fire?
Yes sorry, in order to remove the passcode you would have to reset the device. You can reset it connect to wifi then register your device. All of your purchased/downloaded books will come back onto the device.
Let me know if you would like to proceed I will give you instructions.