If you only want to use PTVnet, then yes, you'll need to use MFSTools first. If you plan on creating a new installation with InstantCake, there is no need to do that.
It *is* possible to install PTVnet on your TiVo's drive without using MFSTools (read here), but it is not recommended.
TechLore Blog
HR10-250, Samsung SIR-S4120R, SIR-S4080R, 2 Philips DSR704s (one connected to a Slingbox A/V). One box used the "Zipper"; rest used PTVnet to enable networking features.


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