About strange software stories...... On IVMS4200 3x i was not able to set opening time for electric lock, and solved with an older version 2.6 of the same application.... As regards mobile apps, Hik connect was no longer able to act on door unlock in android version, while worked well in Apple flavor, contacting Hikvision i discovered that androi app is not upgraded to latest version on Play store, so for solving the problem they gave me an address where ispossible to download latest versions for their apps, now hik connect is back to its original functionality....... The page is Hikvision App Store , hope it can help....