bruh the fuses from the facility won't work idk why I checked with the walktrough too and they were corectly placed but the 55 always remains red and I can't load other slot either because I would lose half my progress (btw the game is soo good and i love the fact that now you can skip the hqrd minigames part but you should really do more than 3 saving slots)
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i got stuck on that for a while too; most walkthroughs show some slots being empty in the elevator fuse panel. in v.1.0.4 (in patch notes in the READ ME.txt) [+ Fixed an issue that allowed the elevator fuses to work without filling all the slots.], they fixed it so you have to fill all the slots. in the bloody operating room that you and Sai enter to escape the primal shadow demon, there's a locked gate that requires a key that you can find in the facility. when you unlock the gate and go through, there will be a fuse numbered 20 that you can use to activate the elevator. you should be able to figure it out pretty easily there, and don't remove the fuse numbered 25 with the door icon (or at least save the game before you do). sorry if it's too late though