I don't have a 3.15 system, but as I understand it, you do need peek+poke support to run USB Firm Loader. Given the way peek+poke works, I'd say you more than likely would need a USB Firm Loader specific to 3.15 systems in order to patch the right offsets.
Thanks, Kinda what I thought. So this kinda makes this hackpack unusable for now... until we can A) Get firmloader running on 3.15 . or B) get the files working with 3.41.
Has anyone managed to get this working on 3.41 yet? I've been really eager to try this but i don't have a 3.15 ps3. I hope cfwprophet will be updating since he got it going as its no easy task to do what he is doing. props cwfprophet hope to see and update soon.