To restore a Threema ID, you need an ID export (or a Threema Safe backup). The ID export consists of 80 digits and letters in groups of four characters (separated with dashes). You string is shown in two ways when exporting an ID: as plain text for copying/pasting and as a QR code.
In the restore menu, you can either enter the long string manually, or you can scan the QR code. Restoration is only possible with an ID export. If you mistakenly scan a public Threema ID, you will see a long string after scanning that starts with “3mid:”. Restoration will not be successful in that case. Please ensure that you are using an ID export for restoration.
