Replacing the store button may be firmware version specific - YMMV (it also did on other 5.6.x firmware version - do strange things that is).
I think the font hack only applies to the KF8 (a.k.a: azw3 format books) what format are your books?
The Kindles do not accept just any old image, they have rather strict requirements.
Post your questions each in there appropriate thread, so other people can find the questions/answers in the future.
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