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New Firmware Update 15503.21007 Is Now Available For Lumia 550

While we all users are waiting for official release of Windows 10 Mobile update, but today Microsoft released an firmware update for Lumia 550 users. Interestingly the update is only available through Windows device recovery tool. The firmware update version jumps from 15461.48007 to 15503.21007. But the operating system version doesn't