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The install script would at worst case leave you with no PDF viewer, which you could then be able to fix.
You wouldn't be locked out of your iLiad e.g. root access would still be available.
Your iLiad doesn't need the PDF Viewer to boot e.g. no risk of bricking.
What the script does is copy your existing PDF viewer to your internal iLiad USB drive. It then copies the version 5 ipdf into /usr/bin/xpdf to have it take over as your PDF Viewer.
The process is fully reversible and frankly the most likely failure mode is the copy from xpdf to the internal drive and having that drive run out of space. If that happened the factory PDF Viewer would be left in place and you would need to free up 50KB of space on your iLiad's drive.
This isn't anywhere near as dangerous as manually installing the [SHELL] hack or the on screen clock.
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