When we try to update 14840 to 14910/14920 in step of apply DB level change, (60% update progress) the upgrade halts and failed.
We can see some locks in SQL... For example: SELECT "ConfFile"."FILEID" FROM "ConfFile" WHERE ("ConfFile"."URL" LIKE N'%/conf/Asset/servicedesk.xml')
We made several updates from SDP 12.0 to 14.8 yesterday, without issues.