IIRC, Tivos weren't introduced until around 1999 so 10 years of hacking them may be pushing it a bit. I also doubt very much that God has anything to do with Tivo upgrades. Hacking the S3/Tivo HD models is pretty simple once you have the PROM modded. You have to let them contact the outside world so blocking updates with either model isn't an option.
I've got my two S3's hacked with just the basics (telnet, tivoftpd, Alphawolf's binaries, & no encryption) so rehacking an upgraded OS is no big deal. It's just a matter of pulling the drive, making a backup, copying the kernel, patching it, restoring the patched kernel, and copying over the rc.sysinit.author file along with any hack files from the inactive partition to the active one and I'm done, except for patching the tivoapp file, which I'll do via telnet after reinstalling the drive.
Making the backup image takes longer than the rest of the process. I could probably get away with just copying the hacked kernel from the inactive partition to the active one, but you never know if the kernel has been changed as part of the upgrade so it's better to be safe than sorry.
While it is true that you can now use TTG to extract shows to your PC, the process of transferring the shows is excruciatingly slooooow. Hacking the Tivo for video extraction using the more familiar methods cuts the transfer time down to a fraction of what TTG takes. I find that more than enough justification for hacking the Tivo, even though it has to be redone with each upgrade.
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