Win10 system Build 14385 updated what function

Microsoft team vacation returns, win10 update speed is also upgraded to a level, then in the latest update of win10, brought a new win10 build version of the download, this update Win10 Build 14385 is mainly repair-oriented, there are not many new features, then we will take a detailed look at win10 Build 14385 specifically repair what is updated.
win10 Build 14385 download address: https://insider.windows.com/

Improvement and repair:
1, repair the PDF file in the Edge browser, and use the touch method ( Zooming and scrolling, etc.) The page that appears when operating PDF is constantly refreshed.
2.Improved the battery life of old models such as Lumia830/930/1520
3. Fixed the SIM card name of dual SIM card model. Possible failures
Known issues:
1. In the phone recording function, the voice recorder is not always displayed. Microsoft has received feedback and is being resolved.
2. The keyboard is browsed on the Edge. In private mode, it can't be displayed immediately, Microsoft is solving it; the temporary solution is to click the privacy status link on the private mode page, then the keyboard can appear in the search/address bar
3, we are changing the backup file format of Windows 10 Mobile In order to reduce the size of the backup capacity in OneDrive. If you use the latest Win10 Mobile Redstone Preview, then when you restore a backup on Win10 Mobile 10586, the starting screen layout will not be restored, the default layout of the default phone. Previous backups will also be overwritten. If you want to go back to 10586 and don't want to break the backup, please turn off the backup function first