> For the complete documentation index, see [llms.txt](https://docs.flightsim-studio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flightsim-studio.com/e-jet-series/experimental-version/things-to-know.md).
# Things to know
We’re currently working on a version with a completely custom-built Flight Management System. This is a complex project, and we have a team of around 200 testers who review our progress almost every week.
#### Installation
If you’d like a behind-the-scenes look, you can switch to the **Experimental branch**.
**Aerosoft One**
1. Go to the product library and select the E-Jets.
2. Uninstall the aircraft if you already have it installed.
3. The experimental installation is in light grey at the bottom.
**Contrail**
1. Go to the respective product page in the Contrail App.
2. Uninstall the aircraft if you already have it installed.
3. Then you will see two installation options: Stable and Experimental.
#### What is Experimental?
Experimental is a snapshot of our internal test build. It’s only updated occasionally when we reach major milestones. Smaller changes are tested exclusively by our beta team.
#### What’s included in Experimental?
The new custom FMS is already integrated. This brings improved LNAV and, for the first time, VNAV support.
#### What should I expect?
This version is **buggy**. Many things may not work as you’re used to, and crashes can happen.
#### Where can I report bugs?
Nowhere. We have a dedicated internal test team that reports bugs based on our own requirements. No action is needed from you.
#### Where can I get support?
There is no support for this version. It’s strictly experimental, and support will only be available once version 1.0 is released.
#### How do I switch back to the Stable version?
Simply uninstall the E-Jets and select the **Stable branch** during reinstallation.