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- Add support for *Thunderbolt* devices.
- Add support for USB tethering from iPhone.
A gray border, called *letter boxing*, is now displayed around the content of web pages when you resize the window of Tor Browser.
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- Allow opening persistent volumes from other Tails USB sticks. ([[!tails_ticket 16789]])
All users must do a [[manual upgrade|doc/upgrade/#manual]].
*Audacity* from 2.1.2 to [2.2.2](https://wiki.audacityteam.org/wiki/Audacity_Versions#whatsnew)
Automatic upgrades are not available to 4.0.
Changes and upgrades
Choose **Remove metadata**.
Copy the known issues from the previous version if they haven't been solved or move them to /support/known_issues if more appropriate.
<div class="caution"><p>All the data on this USB stick will be lost.</p></div>
Fixed problems
- Fix the delivery of WhisperBack reports. ([[!tails_ticket 17110]])