Verify the file purpose
A source-code ZIP is not the same as a model-specific firmware image. Know whether you are downloading project source, a firmware release or documentation.
Match model and branch
Check the exact router model and intended firmware branch. Do not use a file simply because the product name looks similar.
Prepare the router
Use stable power, prefer wired access and avoid firmware work during critical network use. Close unnecessary browser sessions to the router administration page.
Keep a recovery path
Know how to access the model’s rescue or recovery mode and keep a copy of critical settings. Planning recovery is safer than improvising after a failed flash.
Practical takeaway
Keep changes model-specific, document your current settings, and test one change at a time. That approach makes future upgrades and troubleshooting much easier.