This is a known problem and has been admitted by the Microsoft officials. If you are having trouble downloading the updates or your phone get stuck during the update or it gives an error like 8007007B then that means you might have to wait for the next update.
However, sometimes when the new build releases, your phone might not be able to get the new update (by skipping the one that was causing the problem). Your phone might also show that it is updated to the latest build without even installing the update. These issues can be solved with the Microsoft Recovery tool. Follow the methods given below to solve these issues.
Fix Using Microsoft Recovery tool
Note: This method will remove all your personal files and apps. So, backup your data if you don’t want your personal files to get deleted. This might take a while depending on your internet speed. So wait patiently. Once the Software is installed, your phone will be updated to the most recent Windows Version that is approved for your phone. Now follow the steps given below to update to the Latest builds Wait for the Phone to update. Now your phone will be updated to the latest OS build suitable for your phone. If your phone was updated to Windows 8 after the Windows Recovery tool then download the Windows Insider Program app from the app market. Select Level Release Preview to get the Windows 10. Once you have Windows 10 then start from step 4.
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