KB4501835 updates Windows 10 1809 to Build 17763.439

KB4501835 comes out with some quality improvements and updates Windows 10 1809 to OS Build 17763.439. In this release, Microsoft primarily focuses on the Japanese Era calendar and addresses several bugs like- IME issue, NLS registry, CALDATETIME structure, etc. In addition to these, they activated TTS support along with adding new alternative fonts.

As usual, there are some known issues as well in this patch update. Though, the expert has tried to provide solution to most of the bugs; a few remain unresolved. Let’s explore this new build in detail-


Key Changes and Improvements

Microsoft has brought following changes with KB4501835 patch update-

  1. The company addresses an issue which restrains the CALDATETIME structure from managing more than 4 Japanese Eras.
  2. Updates the NLS registry to support the new Japanese Era.
  3. Resolves an issue that causes the DateTimePicker to display the date incorrectly in the Japanese date format.
  4. Addresses a bug which causes Date and Time Settings control to cache old Eras and thus block the control to refresh. As a result, they appear incorrectly.
  5. Earlier, the input method editor doesn’t support Japanese Era Characters. They resolved this issue for now.
  6. They also fixed the issue where Clock and Calendar flyout control displays the wrong day of the week when mapped to a specific date on the month of the Japanese Era.
  7. Adds alternative fonts and updates the existing ones on the Japanese Era.
  8. There is now a Text-to-Speech (TTS) feature activated, this support new Japanese Era characters.
  9. Resolves an issue in Unified Write Filter (UWF) which restricts Hibernate Once/Resume Many (HORM) from working as expected on Unified Extensible Firmware Interface (UEFI) systems.

KB4501835 patch update- Known Issues


After updating your PC with this patch up, you may encounter issues while using the Preboot Execution Environment i.e. PXE. It occurs primarily when you start a device from a Windows Deployment Services (WDS) server configured to use Variable Window Extension.  If that’s the case, it might terminate the connection when you download any image on the WDS server. However, the devices which are not running Variable Windows Extension remain unaffected.

Sol- Microsoft brings the following three ways to solve this bug. They, in general, help you in disabling the WDS server.

Method 1: Start Command Prompt on your system as an administrator and type the following command line-

Wdsutil /Set-TransportServer /EnableTftpVariableWindowExtension:No

Press Enter to execute the above command thereafter see whether it mitigates the trouble or not. If not, follow the next workaround.

Method 2: Make some necessary changes to the Windows Deployment Services UI. They are-

  1. At first, start Windows Deployment Services using Windows Administrative Tools.
  2. Here, expand Servers then make a right-click on the WDS server.
  3. Hit properties and uncheck the box Enable Variable Window Extension available on the TFTP tab.

Method 3: You can fix this bug using registry tweaks as well. All you need to do is to put “0” in the value field of following registry entry-


Once you disable the Variable Window Extension using the above tweak, restart the WDS server services again. It may start functioning properly.


Custom URI schemes are custom-designed for Application Protocol handlers. Such schemes may fail to start any application for local intranet or open trusted websites on Internet Explorer.

Sol- To mitigate this issue, follow these two options-

Option-1: Make a right-click on the respective URL link and open the same on a new window or tab.

Option-2: Enable the protected mode in Internet Explorer for both i.e. local intranet and trusted sites. Here are the steps to follow-

  1. At first navigate to Tools > Internet options > Security.
  2. Here, select Local intranet under Select a zone to view or change security settings, thereafter Enable Protected Mode.
  3. Subsequently, select Trusted sites next Enable Protected Mode option.
  4. At last tap OK to save the changes and restart your Browser.


After installing this update, if you perform certain operations such as rename of files/ folders; it may fail to display error “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs only on those files that either don’t have administrative privileges or have a Custom Shared Volume ownership.

Sol- You can fix the above bug by performing-

  1. Start an operation using a process only when it has administrator privilege.
  2. Don’t perform an operation using a node that has CSV ownership.


Microsoft and ArcaBit have identified an issue on devices with ArcaBit antivirus software installed that may cause the system to become unresponsive upon restart after installing this update.

Sol- The Company has temporarily blocked all such devices which have ArcaBit antivirus program running on them. ArcaBit has recently brought an update to address this bug.

How to get KB4501835 cumulative update

One should install the latest SSU before proceeding to download and install the current LCU on the System. Doing this prevents unwanted trouble that may arise during the update process. In short, it increases the overall efficiency and stability of the operating system.

If you are going to install the KB4501835 patch update on your PC, download and install SSU (KB4493510) first. The same will be offered by Microsoft automatically for your Windows device. You can also have the standalone package of this.

Once you have applied the above SSU on your PC, it’s time to launch the latest cumulative update. Here are the steps to follow-

Step-1: Press Win+I hotkey together to open Settings.

Step-2: Here, select Update & Security next Windows Update.

Step-3: Henceforth, tap Check for updates option on the right pane.

That’s it, download the setup and subsequently install this build on your System.

Source- Update Catalogue