@Lewannet, welcome to our Fitbit Community! I'm happy to assist you with your Fitbit Versa Lite since it won't complete the update. By the way, thank you for trying to get this issue resolved before contacting our forums.
In order to avoid providing the same information, please let me know what troubleshooting steps you have tried.
In the meantime, follow the steps that are listed in this help article. This article may contains steps that you already tried but you can skip them and proceed with the rest.
Keep me posted.
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