(aaps-ci-option1)=
This is part of [Step 2 – Create your signing keystore](BrowserBuildKeystore.md) of the [Browser build](BrowserBuild.md). Make sure you have read the [Option 1 vs Option 2 decision](#aaps-ci-preparation) and downloaded the preparation file.
Option 1 generates a brand-new signing keystore for you. It is suitable for first-time users, or those without a JKS, or who have forgotten the password or alias.
Follow the page that matches the device you are building from:
- Android – the simplest, recommended first choice.
- Computer – Windows, Mac or Linux.
- iPhone / iPad.
You can switch device at any time – just open the matching page.
:hidden:
Android <BrowserBuildO1Android.md>
Computer <BrowserBuildO1Computer.md>
iPhone / iPad <BrowserBuildO1iPhone.md>