While there is no formal academic "paper" specifically dedicated to the Innova Reborn head unit firmware, the technical documentation and community procedures for updating these units provide a comprehensive "paper trail" for a free DIY update.
Why pay when you can do it for free?
Depending on your model year, you can use the following free methods: USB Update update firmware head unit innova reborn free
For older models or those without stable connectivity, you can manually download the update from the official portal and install it via a USB drive. Toyota Software Updates While there is no formal academic "paper" specifically