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Roushan kumarRoushan kumar 

Updating data

I did not new about how much space they provide on free developer account, now after I have mistakenly upodated all my linkedin contact. It will not let me add any data neither delete it. Any other option. 
Jason Curtis NBSFDGJason Curtis NBSFDG
Hi, Roushan, have you tried the Mass Delete feature?
You can also delete data via the Developer console:

Or, you can always just fire up another dev org and start over!
Roushan kumarRoushan kumar
Yes  did tried it several times and this is the resulting message. 
 "Note: You have reached the maximum number (250) of deletable Contacts at one time. If you would like to delete more Contacts, first delete the ones below and then perform another mass delete." 
Ashish DevAshish Dev
You can use

First take backup of all your data, then extracted to csv file and uploaded it to then select "delete contacts" option and selected contact id to delete all.