I lost all my contacts now with no way to get them back Also, new Viber versions offer Cloud backup feature, so you can backup your messages to the Viber’s Cloud service (it will backup only text! not audio/video/image media files!). Also, you will lose all your conversations/messages and possibly media files (you should backup your /viber/ folder to a new location if you care). You will have to activate and re-configure Viber again.

Additionally, all your Groups that you were participating in will be fully preserved, too! Another bonus is that you do not have to uninstall current version of Viber (for example, if you do not wish to upgrade to the latest version for some reason).

Your contacts that were not synced will be now properly displayed with Viber icon and with all contact methods available. Obviously, no waiting for download (and if you are on a metered plan, no additional cost!). For example, say, your friend has added another (new) number and you have deleted the old one from the Contacts list, but in Viber you still see both the new and the old number, without any possibility to delete it! You can also use the above method to fix any other related Contacts Sync issues between Viber and your Phone. Viber App – How To Send Self Deleting Photo or Video message * in newer Android OS versions (such as 4.3 Jelly Bean and up) apps are organised by type (Downloaded, Built-In/Factory/Running/All…) * in older Android OS versions (such as 4.0 Ice Cream Sandwich and below) there is no application grouping

You will have to activate your account again, enter phone number and wait for automated verification process to complete, set your options (privacy settings, chat background, sounds…).

Go back to your Desktop (or wherever you placed your Viber icon) and click on it to restart Viber again.

Click on Clear data button (not Clear cache, that is not enough!).

Go to your Settings > Apps > Downloaded Apps * > Viber.Yes! Instead of full uninstall/install cycle, all you have to do is: This is rarely gonna fix your problem and, as a final and most extreme measure, they are suggesting to completely uninstall and install Viber again. In official Viber FAQ you will find a suggestion to edit your particular Contact’s number format and instead of short format, replace them with a full country prefix version (for example: instead of 001 1234567 use + 567), then wait around 10 minutes, reboot phone and similar nonsense magic. Viber App Backup – How To Save Your Chats Before Deleting VIBER – HOW TO FIX CONTACTS SYNC ISSUE?

Viber update broken