Ah, that explains it then. Here was me thinking the machine had been fully decrypted (which it mostly has, see
here for an interesting read behind the scenes) I wasn't aware of the encryption as well as the signing.
I wonder if the PS4s fake signing research would be of any help here? Another avenue would be to see if one can edit/inject into the boot routine process ala Wii U CBHC to load an emulated VSO filled with edited, decrypted files as as workaround? Or just load one of the available alternates dashes directly like on the OG Xbox with EvoX did using a font overflow?
I'll see if I can dig up the info but I'm pretty certain that there was an approach early on in the PSP CFW scene where its NAND partition access was redirected to the Memory Stick but then that console shipped with FW that allowed homebrew to work right off the bat
I haven't been active in modding consoles for a while but will be perusing
this article to get some insight into the Vita and its structure to see if any aspects jump out. At a glance it seems the current workflow jacks control at the earliest possible entry point anyway and f00d builds upon this.
Either way its interesting so lets see how it goes and best wishes to the team. Also, what do they make of @GrapheneCts PVR_PSP2 GPU libraries? I'm surprised we haven't heard much about its implementation as its akin to DirectX access and can really speed up the visual processing side of everything beautifully.