Hold the button for 10–15 seconds until the power LED flashes abnormally, indicating it is in recovery mode.
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Your best bet is to search community forums (like PHCorner) for firmware versions specific to your region or carrier. For example, a known version for the AIS model is . Other versions mentioned by users include 1.10.21 and 1.12.6 . Hold the button for 10–15 seconds until the