I recently got FF7 8 and 9 on my vita (legit firmware, no hacks) and Blackchocobo will edit the save for 7 with zero issues, however when I save it says its unsigned. any information ive been finding on this topic is nearly 7 years old and I have yet to see any workarounds or otherwise for Vita
The only way based on my research that I can go around this issue is with a ps2 which I don't have, nor do I have a psp.
That is not a question, and you are correct in that you need to use one of the old methods. This applies to ps3 psp and psvita. There is nothing i can do untill the methods are reversed and the keys discovered . (for instance were fairly sure the ps3 method is correct but the keys used are still not known)