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It's Just called the Custom Firmware Package, We have setup a WiKi page that details all it features, Main page LINK HERE, It covers details for standard Humax firmware and the Customised Firmware which can be downloaded Via THIS LINK EDIT
I have just realised that you may have been referring to where the actual Undelete package is. Having installed the Custom Firmware package you can log into the Humax using a P.C. and you will see a Main Web Interface page and under there a Packages page like THIS ONE, You will be able to select Undelete from this list