Update:

Microsoft has made it official that Windows Phone 8.1 GDR2 is now available for Lumia 735 and Lumia 830 in selected markets. The firmware + OS version: 02177.00000.15184.36xxx + 8.10.15148.160 rolling out to both the devices is the same version that has been pushed to Lumia 640 and Lumia 640 XL today.

Nokia Lumia 735 changelog:

  • Device settings can be more easily managed through categorized and searchable settings menu.
  • Bluetooth keyboard support added (Bluetooth HID 1.1 profile).
  • Support for MKV video playback.
  • Set the lock screen photo as your glance screen background.
  • Phone name can be changed from Settings > About.
  • Additional improvements to audio quality, Wi-Fi and cellular connectivity, national roaming, and more.

Nokia Lumia 830 changelog:

  • Improved Wi-Fi connectivity.
  • Device settings can be more easily managed through categorized and searchable settings menu.
  • Bluetooth keyboard support added (Bluetooth HID 1.1 profile).
  • Support for MKV video playback.
  • Set the lock screen photo as your glance screen background.
  • Phone name can be changed from Settings > About.

Source

You can read all the details of Windows Phone 8.1 GDR2 at our dedicated page, where you can watch the GDR2 in hands-on action as well.

Lumia 540 GDR2Microsoft had made it clear that Windows Phone 8.1 update 2 may eventually arrive for Lumia 735 and Lumia 830, thought for older devices it is not clear whether they will receive GDR2 or will directly update to Windows 10 Mobile later this year.

Now, some reports today claim that Microsoft has already started rolling out GDR2 to Lumia 830 with French ROM. It is not available though for Lumia 830 with any other firmware versions yet. In case your Lumia 830 has started receiving the Windows Phone 8.1 update 2, do let us know in comments.

Via