I forgot passcode for my Apple Ipad air. How can i recover or bypass passcode

I would just take it to a instore mobile phone repair man/or lady usually chinese are great at what they do not expensive .

rase your device with iCloud

1. From another device, go to icloud.com/find.
2. If prompted, sign in with your Apple ID.
3. Click All Devices at the top of your browser window.
4. Select the device you want to erase.
5. Click Erase [device] to erase your device and its passcode.

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If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...

https://support.apple.com/en-gb/HT204306 Do not know passcode for ipad Google Search

see if this helps you out.

Is there anything wrong with the passcode? If your iPad is locked and you forget the passcode, please follow the steps below to unlock it.

1.Connect your iPad to your PC or Mac.
2.Select your device in the iTunes sidebar, and click the"Summary" tab.
3.Click "Check for Update". iTunes will show you if there any new version of iPad software is available.
4.Click "Restore iPad". You can finish the restore process by following the instructions given. During the process, a recommend that tells you to back up your files will be given. You can restore your data after the process is complete.

Now, you must have restored your iPad.
Note: Even you bring your iPad to the Apple service center, Apple staff also need to restore your iPad to unlock it. That's to say, you need to erase everything on it.

http://www.leawo.org/tutorial/forgot-ipad-screen-lock-password-how-to-recover-data-from-locked-ipad.html

To help you recover your Gmail account password for signing in through your iphone and ipad, please follow the step-by-step instructions mentioned on the link given below:
http://www.wikihow.com/Recover-a-Gmail-Password

GuruAid.com

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled Follow these steps if you've forgotten your passcode, or if a message says that your device is disabled.
Forgot passcode for your iPhone iPad or iPod touch or your device is...

reset your apple Apple ID password: https://iforgot.apple.com/password/verify/appleid
once you have the new password to iCloud, you will be able to get back into the iPad

There is really no option except to erase the iPad with iTunes. It is a security feature that is built into the iPad operating system. You can follow this guide, although it says it is for iPhone, it applies to iPad too!

http://support.apple.com/kb/HT1212

The best way to figure it out is to hold the Ipad mini against the light and see if you can tell what his unlock pattern is. If his screen is clean you wont be able to tell.

There is no way to unlock it as a passcode also prevents other people from unlocking it to access your data. What you could do is put it into recovery mode and then do a restore which will wipe all data, assuming you have a backup, you can just restore the data.