Can iPad that’s disabled without data backed up be restored without loosing data

Unfortunately if you have forgotten a device passcode, or have a disabled device, you have no option but to erase the device. However, no backup = most data lost. All Apple mobile devices follow the same general procedure but the link below and other links off it provide model-specific instructions:

If you forgot the passcode on your iPhone, or your iPhone is disabled", click here --> http://support.apple.com/HT204306

First, "Remove the passcode" (erase the device) for your particular model. Doing this puts the device into recovery mode (black screen with a cable), after which you connect it to a computer.

Next follow the "Restore your [device]" step to update the software. You must have a computer to do this. If you don't have a computer, borrow one from a friend, or go to an Apple Retail Store or Apple Authorized Service Provider.

During the final "set up and use your iPhone" process you are offered the opportunity to restore your data and settings from a backup, or you can do this at a later stage( https://support.apple.com/HT204184 ). Even if you have no backup, if you were using some iCloud services to sync items such as Contacts or Photos those may reappear once you sign back into your iCloud account --> Set up iCloud on your iPhone, iPad, or iPod touch - https://support.apple.com/HT208681

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On the contingency you are asked for your Apple ID and password AND you have forgotten those:

If you forgot your Apple ID, click here --> https://support.apple.com/HT201354 ; your Apple ID password, click here --> https://support.apple.com/HT201487 , or to jump directly to the forgotten sign-in information help site, click here -->- http://iforgot.apple.com/

What to do after [or before] you change your Apple ID email address or password - https://support.apple.com/HT204071

If you still need help, contact Apple for help with Apple ID account security --> https://support.apple.com/HT204169