How to factory reset an iPad from a flea market

Presumably the iPad disabled or Activation Locked. If so, the iPad is (and will remain) useless to you. In this situation, the iPad cannot be "reset" using the suggestion outlined within the preceding AI-generated reply.

If you are able to contact the original owner, they will require this information:

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be satisfied:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, you’ll not be able to defeat or bypass the Activation Lock. With documentary evidence that you are the original owner (such as the original sales receipt showing the serial number), Apple may be prepared to assist - otherwise they and nobody here will be able to help you.

The All Too Common SAD Reality of Buying … - Apple Community

Here is what Apple suggests when purchasing a previously used device:

Check for Activation Lock before you buy a device from someone else

Before you buy an iPhone, iPad, or iPod touch, from someone other than Apple or an authorized Apple reseller, make sure that the device is erased and no longer linked to the previous owner’s account. Follow these steps to check if the device is ready to use: 

1. Turn on and unlock the device. 
2. If the passcode lock screen or the Home screen appears, the device hasn't been erased. Ask the seller to completely erase the device by going to Settings > General > Reset > Erase All Content and Settings. Don't take ownership of any used iPhone, iPad, or iPod touch until it's been erased.
3. Begin the device setup process.
4. If you're asked for the previous owner’s Apple ID and password, the device is still linked to their account. Hand the device back to the seller and ask them to enter their password. If the previous owner isn't present, contact them as soon as possible and ask them to use a browser to remove the device from their account. Don't take ownership of any used iPhone, iPad, or iPod touch until it has been removed from the previous owner’s account.

You will know that a device is ready for you to use when you're asked to "Set up your iPhone," “Set up your iPad," or “Set up your iPod” the first time you turn it on.

Addendum

The tags appended to your post suggest that you have an iPad2. The iPad2 is fully obsolete - and now has no support whatsoever. Apple have apparently also withdrawn all server-side support for obsolete 32-bit devices (i.e. iPads 1-4 and iPad mini1). Once reset, these devices cannot be re-activated, rendering them unusable.

All 32-bit Apps have similarly been withdrawn from the Apple App Store. With no Apps available for download, even if the iPad could be reset, it would have very limited (if any) practical usefulness.

Most online services require cryptographic services that are not supported by older obsolete devices. As such, many websites and most online services won't work.

On an iPad 2 the easy way is Settings, General, Reset, Erase All Content and Settings. If it asks for a passcode you do not know, connect it to a computer and use Recovery Mode, then Restore in Finder or iTunes. Check the Activation Lock screen before you keep it.

Click here and follow the instructions.

If this produces an activation lock screen, go back to the market and ask for a refund.

If you get a Device Unknown message at any point, Apple has removed support for that model on its activation servers.

(265460)

tillu_code wrote:

On an iPad 2 the easy way is Settings, General, Reset, Erase All Content and Settings. If it asks for a passcode you do not know, connect it to a computer and use Recovery Mode, then Restore in Finder or iTunes. Check the Activation Lock screen before you keep it.

Hello~ The OP bought this from a flea market and can’t be reset at all. Please see the information posted by *Niel* and *LotusPilot* which is correct. Posting AI generated information here is against terms and posting incorrect information here is detrimental to our users and to our forum.

~Katana-San~

Katana-San wrote:

tillu_code wrote:

On an iPad 2 the easy way is Settings, General, Reset, Erase All Content and Settings. If it asks for a passcode you do not know, connect it to a computer and use Recovery Mode, then Restore in Finder or iTunes. Check the Activation Lock screen before you keep it.

Hello~ The OP bought this from a flea market and can’t be reset at all. Please see the information posted by *Niel* and *LotusPilot* which is correct. Posting AI generated information here is against terms and posting incorrect information here is detrimental to our users and to our forum.

~Katana-San~

Hi Katana-San

You might note that this "contributor" has been methodically posting across many ASC communities in last few days (reaching Level 4 from scratch within 24hrs) - but seemingly avoiding the high-traffic communities (e.g. iPhone) where the superhuman posting frequency might be most noticed.

At best, this represents semi-automated posting of AI generated slop - with intent to exploit automated TRR.

LotusPilot wrote:

Katana-San wrote:

tillu_code wrote:

On an iPad 2 the easy way is Settings, General, Reset, Erase All Content and Settings. If it asks for a passcode you do not know, connect it to a computer and use Recovery Mode, then Restore in Finder or iTunes. Check the Activation Lock screen before you keep it.

Hello~ The OP bought this from a flea market and can’t be reset at all. Please see the information posted by *Niel* and *LotusPilot* which is correct. Posting AI generated information here is against terms and posting incorrect information here is detrimental to our users and to our forum.

~Katana-San~

Hi Katana-San

You might note that this "contributor" has been methodically posting across many ASC communities in last few days (reaching Level 4 from scratch within 24hrs) - but seemingly avoiding the high-traffic communities (e.g. iPhone) where the superhuman posting frequency might be most noticed.

At best, this represents semi-automated posting of AI generated slop - with intent to exploit automated TRR.

I reported this user to Joe as I encourage everyone else to do.

Hello~ Absolutely agree. It has in fact been noticed and brought to other’s attention. Thank you for all the correct information that you post as that is what makes this forum unique.

~Katana-San~

lobsterghost1 wrote:

I reported this user to Joe as I encourage everyone else to do.

+1