@hecq: If you want to experiment, take a copy of everything on the book partition. Then, do the update and see if you like it. If you don't, do a factory reset, install the version you do like and restore the files. And the factory reset is only really needed for safety and if you do a big version jump. If you are only going back a few versions, it will probably be OK. You can try installing the version you want and seeing if it works. If it doesn't, you can do the factory reset and restore the saved files.
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