The "base version" is safe, it basically only has a couple of more alphabets in fonts and allows to load PRS+ images without flashing them.
The actuall PRS+ (2.0.3preview) is also save, since it's not flashed, but rather loaded on the fly. You can also easily uninstall it (just comment one line in installer.sh).
You can also load in "safe mode" (i.e. PRS+ not starting at all) any time, by connecting your reader to USB.
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