Update SharePoint custom list Displayform on existing site collection?

I have an existing site collection with a bug that I need to fix where a c开发者_运维问答ustom document list has been created along with an override file for the displayform:

<Form Type="DisplayForm" ToolbarTemplate="BLPDocLibDisplayFormToolBar" SetupPath="pages\kmform.aspx" Url="DispForm.aspx" WebPartZoneID="Main" /> <Form Type="EditForm" SetupPath="pages\form.aspx" Url="EditForm.aspx" WebPartZoneID="Main" /> <Form Type="NewForm" Url="Forms/Upload.aspx" WebPartZoneID="Main" /> <Form Type="NewFormDialog" Path="EditDlg.htm">

Being a novice at SharePoint I have no clue or can find anything useful out there on how I can update the deployed override file Dispform.aspx as it appears that every list has it's own copy of the file.

Anyone know how this can be done?

Thanks in advance.

Dan

Please clarify your question. Do you mean that you have created many lists of this custom type and now need to change the display page to the default one instead of custom?