Microsoft today released Windows 10 build 14390 for Fast Ring Insiders. This build is part of Windows 10 Anniversary Update, version 1607 which is expected to be released on August 2nd, 2016. Before this date, Microsoft is trying to catch all bugs in the software. As excepted, this new build comes mostly with bugfixes.
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The only new feature available in this release is a extension for Microsoft Edge, 'Amazon Assistant':
Amazon Assistant: Amazon’s official browser extension is now available for Microsoft Edge! Amazon Assistant helps you make better decisions wherever you shop online by giving you access to Deal of the Day, Product Comparison, Wish List and Shortcuts to your favorite Amazon destinations. Check out all of the available extensions by launching Microsoft Edge, opening the “…”menu, selecting “Extensions” and then clicking “Get extensions from the Store”.”
The list of bugfixes in Windows 10 build 14390
You should no longer see the error code 0x80004005 when enabling Developer Mode on the “For Developers” Settings page if your PC is using a non-EN-US language.
The list of known issues in Windows 10 build 14390
AWARENESS: A recent fix went into place for the Hyper-V firmware that will that affect the ability to boot Windows Server 2016 Tech Preview 5 VMs with Secure Boot enabled. A fix for TP5 builds has been developed however, due to release schedules, the Insider Preview build changes will be released before the TP5 fix is released. During that time, if you try to boot a new TP5 VM with Secure Boot enabled, it will fail. The workaround is to disable Secure Boot during this period.
If you are a Fast Ring insider, open the Settings app and go to Update & security -> Windows Update -> Check for updates to get this build installed. 
Source: Microsoft/Windows blog.
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i downloaded 14385 some days ago from your site but now i didn’t get 14388 in both ring even 14390 in first ring..why ?
because it waits for 30 days after install.
also, make sure you configured the Insider program and set that you are on the Fast(or slow) ring.
By the way ,when Anniversary update will come in next month,then what will happen? shall i get this update from this 14385 build?
You should get.
thank you and your site is awesome