Sure.
here, for example:
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No Reverse Engineering, Decompilation, Disassembly, or Circumvention. You may not (i) modify, reverse engineer, or disassemble the Kindle or the Software whether in whole or in part, (ii) decompile the Software in whole or in part (except to the extent such right cannot be excluded or limited by law and then only when the express permission of Amazon has been sought and refused), or (iii) create any derivative works from or of the Software, or bypass, modify, defeat, or tamper with or circumvent any of the functions or protections of the Kindle or Software or any mechanisms operatively linked to the Software, for example, by augmenting or substituting any digital rights management functionality of the Kindle or Software.
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and then:
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Termination. Your rights under this Agreement will automatically terminate if you fail to comply with any term of this Agreement. In case of such termination, you must cease all use of the Software, and Amazon may immediately revoke your access to the Service or to Digital Content without refund of any fees. Amazon's failure to insist upon or enforce your strict compliance with this Agreement will not constitute a waiver of any of its rights.
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ie you modify the firmware, and you lose all the rights granted by the terms of service, which includes the warranty.