Site collection locked & stucked in read only mode

I do have a SharePoint (2013) site collection that is stuck in read only mode due to a backup that was either interrupted or didn't terminated properly.

I'm unable to unlock from :

• Site Quotas and Lock in Central Administration (option is greyed-out)
• Stsadm : operation completes successfully but no change
• Using PowerShell : same behavior as stsadm

Solution it worked for me :)

down vote

An alternate solution to the problem of not having upgraded to April 2013 CU is a simple powershell script that uses reflection to set the value of the internal 'MaintenanceMode' property:- $site = Get-SPSite http://urltofreakinlockedsite/ $site.GetType().GetProperty("MaintenanceMode").GetSetMethod($true).Invoke($site, @($false))