Supercurio, your notes on RFS are appreciated, but irrelevant if the guide I've provided is followed.
As a precaution, never mount an RFS Filesystem to your computer directly. It will corrupt the filesystem and Voodoo Lagfix will fail and bootloop. Apply Voodoo Lagfix after pulling the partitions. Flash a kernel, reboot, then pull partitions. This way you can mount it on your computer.
why to use this? using this method you will be able to ensure what is on your device is on your user's device. Rather than expecting that they are running a certain version of a certain firmware prior to applying an update.zip Heimdall One-Click also provides the easiest method to installing a custom kernel in order to get ClockWork Mod on a stock device.
As Supercurio mentioned, repackaging an odin file as a Heimdall One-Click may be a hassel, but Heimdall One-Clicks work on Linux, Windows or Mac OS-X.
I'm not going to go through all methods of development nor the functions of each file. However, if you wish to perform a factory reset, use a params.lfs from an official firmware package. If not, use the params from an active device.
There's downfalls to each method of distribution.
Update.zip requires that the user have a specific version of a specific firmware on their device. Heimdall One-Click does not require this.
Update.zip allows modification of firmware on a device. Heimdall One-Click will obliterate all firmware.
Update.zip is exactly as it says, it is an update. Heimdall One-Click is an entire firmware package.
Update.zip requires knowledge of a proprietery scripting format. Heimdall One-Click requires knowledge of Android filesystems only.
For this reason, packaging as a Heimdall One-Click makes your firmware package immortal rather than having a lifespan/dependency. A properly packaged Heimdall One-Click will always work without any expectation of the firmware on a user's device. It's a very clean way to distribute firmware.

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