We apologize for any inconvenience, but we’ve made the site read only while we’re making some improvements. 0x80070003

 We apologize for any inconvenience, but we’ve made the site read only while we’re making some improvements.

# $Admin = new-object Microsoft.SharePoint.Administration.SPSiteAdministration('http://xxxx/sites/xxx/')
$Admin.ClearMaintenanceMode()









Delete site collection by Remove-SPSite -identity -GradualDelete. or Restore-SPSite gettting error
<nativehr>0x80070003</nativehr><nativestack></nativestack>
DELETE THE SITE FIRST FORCEFULLY.

$siteUrl = "http://xxxx/sites/xxx"
$site = get-spsite $siteUrl
$siteId = $site.Id
$siteDatabase = $site.ContentDatabase
$siteDatabase.ForceDeleteSite($siteId, $false, $false)