As HarryT said, the ads is tied to your serial number (or more specifically, your unique certificate). If your serial number is not marked on amazons server as "ad supported", you will not get pushed ads and even if you copy the ads from another device, you can't request any coupon codes. So assuming you have an ad supported kindle, can you remove the banners and keep the offers? In short, no. However if you want to decompile and deobfuscate some java code, recompile and resign it, anything's possible.
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