Microsoft has just updated its Windows 10 Mobile Build 14267 Blog Post to add the issues Lumia 550 users are facing in the “Known issues” of the build and has also asked the Lumia 550 users to avoid the build, if they haven’t downloaded and installed it yet. It seems Build 14267 caused USB connection issues on Lumia 550, making it unable to charge or connect to PC via USB. Microsoft has also offered solution to Lumia 550 users that will help them recover the device to Windows 10 Mobile stable Build 10586.107.
ADDED 2/20 – Several Windows Insiders with a Lumia 550 have reported an issue where their phone no longer charges or connects via USB after upgrading to Build 14267. If you have a Lumia 550, we recommend holding off going to this build. If you have hit this issue we recommend rolling back to Build 10586 using the Windows Device Recovery Tool.
How To Recover Lumia 550 with USB not working:
You will need to connect your phone to your PC via USB first, open the Windows Device Recovery Tool and choose “My device was not detected”, choose “Lumia” and turn off your phone and let it reboot in order for the Windows Device Recovery Tool to detect your phone and reinstall. If you need to download the image, your phone may reboot back into the OS, once the image finishing downloading completely – reboot your phone again and it should begin reinstalling Windows 10 Mobile.
If your Lumia 550 is really low on battery, switch your phone into flashing mode by turning your phone off first and press power button and then volume up until you see a lightning bolt on your phone’s screen. This will allow your Lumia 550 to charge. You should let it charge a bit before using the Windows Device Recovery Tool to roll back to Build 10586.
If this is the first time that you will use Windows Device Recovery Tool, click here to read our tutorial to get some familiarity with he tool.