How to add Keystone as a signer for a vault?

1. Preparing your Keystone:

• Initial Setup: Initialize your Keystone Essential or Pro by following the dedicated setup guide.(https://support.keyst.one/getting-started/setting-up-keystone-new)
• Firmware Update: Ensure you’re running the latest Keystone firmware. If you’re using it for Bitcoin exclusively, select the Bitcoin-only version.(https://support.keyst.one/getting-started/firmware-upgrading)

2. Setting Up Bitcoin Keeper App:

• Installation: Download and initiate the Bitcoin Keeper app, establishing a new wallet in the process.
• Vault Configuration: Decide your vault's m-of-n configuration.  

3. Pairing Keystone with Bitcoin Keeper:

• Keystone Activation: Power on your Keystone hardware wallet.
• Retrieve XPUB QR Code: Navigate to [Menu] > [Multi-sig Wallet] > click on the [•••] button (upper right) > select [Show/Export XPUB]. This action will generate a QR code containing your XPUB.
• Access Manage keys in Keeper: On the Bitcoin Keeper’s home page, click on “Manage Keys”.
• Initiate Device Addition: Opt for “Add Key”.
• Keystone Selection: From the list of available devices, select “Keystone”.
• Preparation: Review the guidelines, ensuring all requirements are met, then click on “Proceed”.
• XPUB QR Scan: Scan the XPUB QR code that’s displayed on your Keystone.
• Finalization: After a successful scan, your Keystone will be recognized as a signer.