I spent AGES trying to figure out how to upgrade the Firmware on a Cisco SPA504G VOIP phone; hopefully this answer will save others countless wasted time. Cisco heretofore included an .exe with their FW updates to accomplish the process. FW version 7.6.2 however there wasn't any.. Models SPA501G, SPA502G, SPA504G, SPA508G, SPA509G, SPA512G, and SPA514G USER GUIDE. Cisco Small Business SPA50X and SPA51X SIP IP Phone User Guide 2 Contents Chapter 1: Getting Started 6 About This Document 6 Overview of the Cisco Small Business IP Phones 8 Caring for Your Phone 8
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This document describes the 7.x firmware update to the SPA525G, SPA501G, SPA502G, SPA504G, SPA508G, SPA509G IP phones. The first draft was issued on November 5th. A revised issue was published on November 9th. Document revised on January 20th for 7.4.3 and PVC2300 and WVC2300 camera support Firmwar.. It seems you missed Administrator's guide - the basic manual for the SPA504G device. In short: place firmware on a HTTP, FTP or TFTP server; reset phone to factory default (optional but recommended to be on safe side) configure 'Upgrade Rule' to refer it. Start with 7.5.2b firmware, continue with a more recent firmware according your wishes.
