Tell me how to edit and repackage .IMG

I need an expert familiar with Linux-based .IMG firmware files for TLYARD Tesla Head-Up Display systems. Your task is to create a short, clear document or guide that shows me exactly how to:

Extract the HUD’s update.img firmware.
Make a small visible change (for example, update a UI text label or logo).
Repackage it correctly so the HUD accepts and installs the new image without errors.


You’ll provide a step-by-step tutorial using real commands (Mac or Linux preferred), explain the directory structure (/ui, /etc, /tr), and confirm one working example that boots on the device.

Deliverable:

One detailed PDF or text guide
One sample modified .img or change (for testing boot and visual confirmation)

Here is the .IMG file to make sure you can do it before. Thanks!
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