@ixtab: Maybe you should read my post more carefully? To me the logic behind my question seems aparent: His Kindle DX currently runs Kindle Keyboards firmware, so instead of me taking time to study the whole Kindle 3.1 software for Kindle 2, 2i, & DX
topic and/or PM @yifanlu
to be able to make educated guess
to the question "Does Kindle DX/Kindle 2 runing FW 3.x use 100% Kindle 3 files,or they use some mix of their original FW and new FW files?", instead I've chosen to ask 1 programmer (you) and 1 user who is already using both "moded DX" and this font size modification to make a better guess
(for both of you have more knowledge on the subject) not to make any guaranty
to me that it will work on Kinde Keyboard.
I may be a noob (to some extent) but I "know" that the same modification can be done by pulling those two .jar files from my Kindle Keyboard and pushing them back after edit.
But ok, here is another strategy? Is it possible (and is it enough ?) to do a checksum comparison for:
1) original files from DX,which I would ask @ihor
to PM me
2) files pulled from my Kindle Keyboard
and if the checksum is the same >>> I can use pre-edited .jar files from provided .zip attachment ?