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After the Windows was updated and tried to enter the synchronization, nothing happened. What to do?

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Made a clean update of Windows. Download Mozilla. After that I tried to go into synchronization, but the browser did not synchronize and wrote: "the last synchronization: January 1". Usually you need to log in to the old devices and confirm the synchronization, but I can not do this because the new and old device is the same! Just after the update, the name changed. What now?

Made a clean update of Windows. Download Mozilla. After that I tried to go into synchronization, but the browser did not synchronize and wrote: "the last synchronization: January 1". Usually you need to log in to the old devices and confirm the synchronization, but I can not do this because the new and old device is the same! Just after the update, the name changed. What now?

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What about any other device that is connected to the Firefox Account? Does Sync still work on that device?