This is a bug in early firmware builds (T676D_V1.0.2). Update to version 2.0.5 or newer via OTA.
You will need the or SP Flash Tool (Unisoc version).
For devices that are unresponsive or experiencing major software glitches, TCL provides a desktop application. You can download the Mobile Upgrade tool from the TCL website . This tool can often repair a "bricked" device by re-installing the official factory firmware. Manual Firmware Flashing (Advanced)
The safest and most reliable way to manage your is through official manufacturer channels.
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