In order to unwind from FBReader 0.8.14 to 0.8.4 you first need to uninstall FBReader. The attached application does this, including uninstalling FBREADER entries in the registry - so first install
iliad-regutils. I used it on 0.8.14, but it should also work on 0.8.4 (e.g. if you added it to the registry). It does not give any indication of success, but installing an earlier version of FBReader should now work. If you don't care about the registry stuff, all that is actually needed is:
Code:
ipkg remove fbreader
which can be run from mrxvt. The actual script also makes a backup copy of registry.xml, and updates it to remove FBReader. It leaves the copies of registry.xml in the script directory in case something goes wrong.