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The term upgrade refers to the replacement of a product with a newer version of that same product, however, it is most often used in computing and consumer electronics, generally meaning a replacement of hardware, software or firmware with a newer or better version, in order to bring the system up to date or to improve its characteristics. The word is also used by audiophiles to describe the replacement of a product with a better quality product with the aim of bringing enhancements to sound quality.
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Diamondhead vs Four Arms, 
