# Emulator  1. [build](build.md) the emulator 2. run `emu.sh` 3. to use [bridge](https://github.com/trezor/trezord-go) with the emulator support, start it with `trezord -e 21324` ## Profiles To run emulator with different flash and sdcard files set the environment variable **TREZOR_PROFILE** like so: ```sh TREZOR_PROFILE=foobar ./emu.sh ``` This will create a profile directory in your home ``` ~/.trezoremu/foobar``` containing emulator run files. Alternatively you can set a full path like so: ```sh TREZOR_PROFILE=/var/tmp/foobar ./emu.sh ``` When the **TREZOR_PROFILE** is not set the default is ```/var/tmp``` .