# Building Firefox OS for Symphony GoFox F15

Building Firefox OS for Symphony GoFox F15 is pretty straightforward, but requires a few extra steps than a standard Firefox OS build for most other devices. The device `dolphin` refers to a family of devices powered by Spreadtrum chipsets. So, logically, you would clone the `mozilla-b2g/B2G` repository and configure a build environment for dolphin.

```bash
git clone https://github.com/mozilla-b2g/B2G.git
cd B2G
./config.sh dolphin
```

The resulting images will result in a device showing a white bootscreen if flashed to a GoFox F15. Why? If you plunge down into this repository, you will find a lot of target devices to build for. `scx15_x3542plus` is our target device, this denotes our Symphony GoFox F15. However, the device `scx15_sp7715ga` is selected by default, causing the conflict. To resolve this, just do a little search and replace in the [`config.sh`](http://config.sh) file.

```bash
sed -i 's/scx15_sp7715ga/scx15_x3542/g' config.sh
```

Now, we are ready to build Firefox OS for GoFox! Make sure to use the `v1.4` or `v2.1` branch to build, upto writing the blog posts, the other branches failed to boot on GoFox F15 in my experiments.

```bash
BRANCH=v1.4 ./config.sh dolphin
```

And then finally make sure you have something to do while you wait for the very lengthy build process to complete, and issue a build.

```bash
./build.sh
```

And you will have your images (`boot.img`, `recovery.img`, `system.img`, `cache.img`, `userdata.img`) ready in `out/target/product/scx15_x3542` to be flashed via fastboot