[RolandP3]

Last night my daughters phone updated WhatsApp. At sometime on the day the app didn'tt work anymore, saying the app has to be updated (not possible because the newest version is installed). Nothing helped (switch off, soft reset etc.). I deleted the app and reinstalled it, but the Backup on the SD card wont be accepted. All my daughters chats of two years are gone, which is not funny for a teenage girl. I tried everything: Making a new backup on OneDrive and replacing the file with the SD card backup, then deleting and reinstalling again. WhatsApp will read the replaced OneDrive backup, saying there are 82 messages (it should be hundreds) but will show even none of these 82. I guess WhatsApp changed the backup format or procedure? What can I do? Im desperate. The backup file is 1,6 MB. Can it be corrupt?