# HELP - Upgrade Mender / Change UUID of Device - HELP
**URL:** https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287
**Category:** General Discussions
**Created:** [November 8, 2021, 3:03pm UTC](https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287 "2021-11-08T15:03:54Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@neoweb](https://hub.mender.io/u/neoweb)
#### Post date: [November 8, 2021, 3:03pm UTC](https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287/1 "2021-11-08T15:03:54Z")
Hello,
I had someone clone using dd a mender device. How can I rotate the UUID so mender sees it as a new one?
I am also using like a 2 year old version of mender. Is it easy to upgrade.
All of these devices use Raspberian, and I am using hosted mender.
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### Author:  [@dellgreen](https://hub.mender.io/u/dellgreen)
#### Post date: [November 8, 2021, 4:26pm UTC](https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287/2 "2021-11-08T16:26:59Z")
i think you will probably need to deploy to it a new update that replaces the mender device keys so that it appears as a new device in the mender cloud server.
[https://docs.mender.io/3.1/overview/device-authentication](https://docs.mender.io/3.1/overview/device-authentication)
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### Author:  [@neoweb](https://hub.mender.io/u/neoweb)
#### Post date: [November 12, 2021, 7:42pm UTC](https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287/3 "2021-11-12T19:42:18Z")
I was looking at the docs.
Do you know how I do this?
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### Author:  [@dellgreen](https://hub.mender.io/u/dellgreen)
#### Post date: [November 12, 2021, 11:20pm UTC](https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287/4 "2021-11-12T23:20:01Z")
this may help
> [@Delete a software installed with Mender](https://hub.mender.io/t/delete-a-software-installed-with-mender/4274):
>
> While trying to use Mender I used the hello-world Docker example and everything went smooth Now, the problem is, even if I remove the image and the container, under the device Dashboard in Mender on Installed Software it says that the device has installed docker hello-world-container-update Is there a chance to remove it? I’ve tried to remove the device, uninstall and reinstall Mender but it seems it remembers the device in some way
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### Author:  [@neoweb](https://hub.mender.io/u/neoweb)
#### Post date: [December 9, 2021, 4:48pm UTC](https://hub.mender.io/t/help-upgrade-mender-change-uuid-of-device-help/4287/5 "2021-12-09T16:48:15Z")
This is what I figured out to make the device present a new key:
```auto
rm /data/mender/mender-agent.pem
bash /usr/share/mender/identity/mender-device-identity
cat /etc/mender/mender.conf
sudo killall mender
sudo mender -daemon
authorized new key
```
the bash mender-device-identity was in there for a reminder for me.
I have some devices with the same cpu serial and mac address so it is an issue for me that i have to solve in the future i think, but i cant remember right now if that is true.