What's more, a firmware package generated in this fashion can be automatically updated in the future if the device is setup properly. To complete the process, the firmware package must be signed, the new firmware pushed to the web server, and a new version number needs to be added to the update URL. This means that once the firmware package is being pushed to the web server then it is automatically downloadable and installable, and it doesn't require manual intervention by the end user. Of course, since the firmware package can be automatically pushed to the web server then the risk of someone else pushing malicious firmware can be contained fairly well.
Finally, as mentioned previously, a firmware package can be updated using a web server. In this case, the firmware package is pushed to the web server via HTTP, the firmware package is automatically downloaded by the device, and then the firmware package is updated. This is a relatively simple process, but there are a few things to note. For example, if the firmware package is signed then the firmware package needs to be re-signed with the same private key that was used to sign the original firmware package, and the new version number needs to be added to the update URL. As such, updating a firmware package can be a little tricky, but it's still quite easy to do.
This technique is known as Software Update Management (or SUMP) and is used by manufactures of embedded software in their devices. For example Android phones have an SUMP app on them to manage the updating of the firmware and application software. This technique is used by manufactures to provide a seamless software update experience for users and is very similar to how a web browser downloads and installs new versions of software like Firefox or Chrome.
Once the directory is setup then any device can be manually pointed to the directory and the phone will utilize HTTP to download and apply the firmware. Also this process can be used to downgrade software if needed as multiple versions can be stored in the same location and a menu will be presented to allow the desired version to be installed. If utilizing an Internet capable phone then it is recommended to verify that the Internet browser supports Flash, as it is a required component for creating a custom firmware.
Typically a device has a toolchain available in ROM which can be used to create a firmware for that device, however for some devices the toolchain is located on a dedicated hardware card which is soldered directly to the device. If the device has a toolchain then it is very easy to create a firmware, however if the device doesn't have a toolchain it is no longer that easy. For example the VeriFirm Pro device from VeriFirm only comes with an
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