Now you can get Windows 10 on a $139 Lumia phone - The Verge
Microsoft Lumia 550 - Full phone specifications
Here is how Microsoft can push OS updates to Windows 10 Mobile without carriers now (and forever) | Windows Central
New firmware for Lumia 550 now available through Windows Device Recovery Tool | Windows Central
New Firmware update rolling out for Lumia 550 now
Microsoft brings Windows 10 to budget-priced Lumia 550 - CNET
Microsoft Releases Firmware Update For Lumia 550 - Prime Inspiration
Microsoft Lumia 550 Specs, Features (Phone Scoop)
Microsoft Lumia 550 Review
New Firmware update rolling out for Lumia 550 & 650 now - Nokiapoweruser
Microsoft Lumia 550 vs Lumia 650 comparison: budget showdown - Neowin
Now available: the new Microsoft Lumia 550 | Microsoft Devices Blog
Microsoft Lumia 550 offers Windows 10 for a low price (pictures) - CNET
Microsoft Lumia 550 review | TechRadar
Original Nokia Microsoft Lumia 550 Unlocked 4.7 Inch Quad Core 1gb Ram 8gb Rom 5mp Camera Windows Mobile Os 1280x720 Cellphone - Mobile Phones - AliExpress
Software | Perform a software update
Microsoft's Lumia 550 offers entry-level Windows 10 for $140 | Engadget
Nokia Lumia 550 Black Microsoft Windows 10 Wifi 4G GPS Unlocked Smartphone 8GB | eBay
Lumia 550 first impressions: Why does this exist? - MSPoweruser
Lumia 650 and Lumia 550 gets new firmware update with stability improvements - MSPoweruser
Lumia 550 Insiders advised not to update to Windows 10 Mobile Redstone Build 14267
New Firmware Update 15503.21007 Is Now Available For Lumia 550 - Nokiapoweruser
New firmware update for Lumia 550 and 650 now available