The update times error 800705B4 occurs in Windows phone when trying to update. It is an update error so you must try to get rid of this problem. Windows phone also downloads the latest features and technologies when you update it and compatible with the latest hardware or software. Missing date time, browser map, search history, cookies etc. are the issue behind this error. System or device date time has required a component for an update so it must match with Windows online date and time.
Manual steps to fix update times out error 800705B4-
If you have connected your phone to computer then disconnect it and delete the browser history of internet explorer, maps, and search
i) Delete browser history a) Go to Start
b) App list
c) Click on settings, Applications
d) Tap internet explorer
e) Delete history option
f) Delete your browser history
ii) Delete map history because it will delete pins, downloaded maps images etc.
a) Go to Applications
b) Select Maps and go to the Delete history
c) Click on Delete option
iii) Delete history from search
a) Go to applications list and select search
b) Go to Delete History option the delete
Now connect your phone with your system or computer and again try to update. If the problem not solved then you can also try the set the Windows phone date and time. If the date and time is missing then you have to set date and time manually-
a) Disconnect the phone from the computer
b) Go to settings by clicking on Start, App list
c) Tap Date and Time
d) Turn off the option “Set automatically”
e) Correct the Time zone, Date and Time
Again connect your phone to computer and try to update Windows phone to fix update times out error 800705B4. You also need to scan the phone and reset because if the internal file missing is the issue then it can be solved. There is also another way to fix update times out error 800705B4 which is the use of third party tool so download and install Advanced System Repair Tool and run to fix it automatically.