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download blobsaver to you computer and get your apnonce/generator pair from the phone. Write these down just to be sure. And now you can use that same blobsaver program or either of the online services tsssaver.1conan.com or shsh.host to save your blobs. You can only start with the blobs that are currently officially being signed by apple.
For the on-device blobs, if you have a mac you could use eg. Déverser, it can surely be done on linux, if you just look at that script. I'm not personally sure if img4tool has been built for windows but if it is then it shouldn't be a problem. (you need to get jailbroken for this of course, eg. using Xina15)