> For the complete documentation index, see [llms.txt](https://guide.cronuszen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.cronuszen.com/quick-start-and-downloads/step-2-update-firmware.md).
# STEP 2: Update Firmware
## Update Firmware
{% hint style="info" %}
Setting up for the first time? The All-in-One — Easy Setup covers this as part of the full walkthrough.\
This page is for updating on its own.
{% endhint %}
***
### :list-check: Before you start
| | |
| ------------ | ------------------------------------------------------------------------------------ |
| **Software** | [Zen Studio Live](https://zenstudio.collectivemindsstore.com/) in the Chrome browser |
| **Cable** | A USB-C **data cable**, not charge-only |
| **Port** | The **top port** on the Zen |
| **Button** | The small blue button on the back |
{% hint style="warning" %}
On a charge-only cable the Zen lights up but stays invisible to your computer. If your phone's files show up when you connect it with that cable, it's a data cable.
{% endhint %}
***
### :arrows-rotate: Update
{% stepper %}
{% step %}
#### Unplug everything
Remove every cable from the Zen. The next steps only work if the Zen starts out with nothing attached.
{% endstep %}
{% step %}
#### Hold the blue button
Turn the Zen around so you can see the back and find the small blue button. Press and hold it, and keep holding.
{% endstep %}
{% step %}
#### Plug in while still holding
With the button still held, plug the USB data cable into the **top port** of the Zen.
The order is what matters: hold first, then plug in.
{% endstep %}
{% step %}
#### Connect in Zen Studio Live
Click **Update Firmware** in the bottom-left corner, then click **Connect Device**. Choose **Cronus Zen** from the list and click **Connect**.
{% endstep %}
{% step %}
#### Start the update
Click **Update to latest**. The firmware now writes to your Zen.
{% endstep %}
{% step %}
#### Wait for it to finish
This takes a while. Do not unplug the cable and do not close the page while it runs.
When it is done you get a success message that says **Firmware updated**. Click **Close**.
{% endstep %}
{% step %}
### **Prefer to watch someone do it?**
We have a short video that walks through connecting your Zen to Zen Studio Live.
{% endstep %}
{% endstepper %}
{% embed url="" %}
Updating the Cronus Zen firmware
{% endembed %}
{% hint style="danger" %}
**Do not interrupt the update.**
Unplugging the cable or closing the page part-way through can leave the Zen with half-written firmware. Let it finish, however long it takes.
{% endhint %}
***
### :globe: Alternative: Web Update Tool
The online firmware update tool works in Chrome and Edge, on Windows®, macOS®, and Android® — USB OTG is required on Android®.
Open the Web Update Tool
***
### :triangle-exclamation: If something goes wrong
| Symptom | What to do |
| ---------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- |
| **Cronus Zen**™ is not in the list | The Zen is not in the right mode. Unplug the cable, hold the blue button again, and plug the cable in while still holding |
| Still not in the list | Try a different cable — a charge-only cable will not work here either |
| Nothing happens after **Connect Device** | Unplug the Zen, plug it back in, and click **Connect Device** again |
***
---
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