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Store these backups on two different drives (PC and cloud).

A: USB driver issue. Reinstall MediaTek USB VCOM drivers, disable Driver Signature Enforcement on Windows, and try a different USB 2.0 port. Firmware TCL 20E

There are two primary ways to update your device's software: 1. Wireless Update (FOTA) Store these backups on two different drives (PC and cloud)

Firmware TCL 20E: The Ultimate Guide to Downloads and Installation disable Driver Signature Enforcement on Windows