In the first post I don't see you specifying T1, but now you have and I have found the manual.
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51a923bb8 .
You already have the hub and the app, yes? So according to the instructions, when the device is not detected, you have to press the On/Off button for a long time (more than 5 seconds) to restore the factory settings.
The discussion addresses how to connect the Aqara LED Strip T1 to the Aqara M1S Gen2 Hub for HomeKit integration. Initial clarification confirmed the LED strip model as T1. The Aqara M1S Gen2 Hub and its app are prerequisites. According to the manual, if the LED strip is not detected, a factory reset can be performed by pressing the On/Off button for more than 5 seconds. The LED strip is detectable, but the user’s main interest shifted to scheduling automatic on/off times via the hub or app, which was identified as a separate topic. A link to a new discussion on setting timed automation for the Aqara T1 LED strip was provided. Summary generated by the language model.