Error code

Windows 0x800705B4

WINDOWS0x800705B4
System Error Code· A POSIX/system errno returned when a system call fails.

What it means

This operation returned because the timeout period expired..

How to fix it

  1. Run the Windows Update troubleshooter.
  2. restart the device and retry.
  3. run DISM /Online /Cleanup-Image /RestoreHealth.
  4. run sfc /scannow.
  5. ensure adequate free disk space and a stable connection.

Not affiliated with Windows. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.