When I copy and paste the following link (https://s3-us-west-2.amazonaws.com/solo-board/package_jewelbots_index.json,https://s3-us-west-2.amazonaws.com/friendship-board/package_jewelbots_friendship_index.json) under the additional boards manager in preferences for Arduino IDE and I look for the boards I only see 2 listed. It is missing the Firmware Update board.
Thank you for pointing this out. The firmware board was removed as it is redundant. I will update the documentation today. All you need is the Friendship and Solo boards.