kobol-wiki/docs/helios64/install/sdcard.md

# Install OS to microSD

## **Step 1** - Download an Helios64 image build

You will need first to download an image to write on the microSD Card.

Go to [Download](/download/#helios64) and chose one of the latest build.

!!! info
    OMV (OpenMediaVault) is only supported on Debian OS.

##  **Step 2** - Writing an image to a microSD Card

You will need to use an image writing tool to install on your microSD Card the image build you have downloaded.

### Under Windows, Mac OS or Linux (via Graphic Interface)

Etcher is a graphical SD card writing tool that works on Mac OS, Linux and Windows, this is the easiest method for most users. Etcher also supports writing images directly from XZ files, without any prerequired decompression. To write your image with Etcher:

- [Download Etcher](https://www.balena.io/etcher/) and install it on your computer.
- Insert the microSD Card inside your SD card reader (microSD to SD adapter might be needed).
- Open Etcher and select the Helios64 image file from your local storage.
- Select the microSD Card you wish to write your image to.
- Review your selections and click 'Flash!' to begin writing data to the microSD Card.

![Etcher](/helios64/install/img/etcher_flash.png)

### Under Linux (using dd via Terminal)

Armbian images are using XZ compression format, therefore we need xz-utils or xz tools to decompress the image first.

for Debian-based distribution (Debian/Ubuntu) you can install the utility using following command:
```bash
apt-get install xz-utils
```

in RedHat-based distribution (RHEL / CentOS / Fedora Linux) users can use this command:
```bash
yum install xz
```

after installing the compression tool, you can now decompress the images:
```bash
xz -dk Armbian_20.08.0_Helios64_buster_current_5.7.15.img.xz
```

finally we can write the images to sdcard using dd:

```bash
sudo dd if=Armbian_20.08.0_Helios64_buster_current_5.7.15.img of=/dev/sdX bs=4M conv=fsync status=progress
```

*Replace the filename by the image file name you downloaded.*

!!! note
    /dev/sdX is where the microSD is mapped in your Linux machine, change the 'X' to your corresponding mapped device. If you set /dev/sdX to a wrong device then you might risk erasing a hard drive or different device than the designated microSD.

##  **Step 3** - Wire Helios64

!!! warning
    Always proceed with caution when manipulating 110/220V appliance.

!!! important
    If your system has the UPS battery accessory installed, then check your board is really powered off before going any further. Check [Front Panel System ON LED](/helios64/front-panel/#helios64-enclosure) or [Board System ON LED](/helios64/led/) is **off**. If not *off*, then press Power-On Button for ~4 seconds until System ON LED goes off.

1. Insert the prepared microSD Card.

2. Connect your computer to the serial port with the Type-C to Type-A USB cable.

3. Connect Helios64 to your home network with the Ethernet cable.<br>*Choose LAN2 port if you have 2.5Gb network.*

4. Plug-in the DC power connector. **Don't power-up the Power Adapter yet.**

![Connections with Enclosure](/helios64/install/img/connections_A.png)

If you are using Helios64 without an enclosure:

![Connections without Enclosure](/helios64/install/img/connections_B.png)

Now the setup is ready for its first start, go to [First Start](/helios64/install/first-start/) page for further instruction.