If you still have issues, I can help you or guide you through using Pro Flash . Let me know: Which iPhone/iPad model are you using? Which iOS version are you trying to flash? Is the iOS version currently signed on IPSW.me?
Have you successfully fixed the SHSH error using one of these methods? Share your experience in the comments or community forums—your insight could help others facing the same issue with the next new iOS version. how to fix error unable to request shsh on 3utools when new
If 3uTools keeps failing, use the :