Okay, so here's our progress today.
I had him restore his system to his A9LH SysNAND backup with Hourglass9, everything went swimmingly, he's back to his stock setup with FBI injected to H&S.
Upon attempting to reinstall the FBI, Luma Updater, and HBLauncher CIAs via QR code, he is met with the following two errors, the first was something about HTTP unreachable, and the second was FAT Operation Denied.
Thinking this was an issue with his network or QR codes, I had him download the CIAs on his computer, copy them to his SD card, and try to install them that way.
The first one he tried was FBI cia, which gave this error: Already Exists.
I'm thinking okay, maybe it's because FBI is actually already installed but the ticket is missing, lets try to use FBI's ticket installer and install the FBI ticket. He is then met with this error:
So I said, alright, let's try to install the TikShop CIA and see if we can just brute force all the tickets back into the system. Upon trying to installed the Tikshop CIA from his SD card, he is once again met with the Fat Operation Denied Error:
So, I had him go into his system settings and data management, it's showing all his games with grey x's and Tikshop, Luma Updater, and HBLauncher all "installed" However, his home screen does not contain any of these items and he is getting those FAT Operation Denied errors for everything he tries to install.
I am currently extremely confused and I do not know what to do next.
Can anyone make any suggestions? As far as his SD card goes, it's a 64GB Sandisk that originally came with his phone. He formatted it using the typical GuiFormat tool everyone recommends with the 32k allocation size.
Thanks for the help guys