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: Use the Smartphone Flash Tool (SP Flash Tool) . This is common for models like the Aquaris M and E series.

: If you are looking to switch to an alternative OS like Ubuntu Touch, tools like the UBPorts Installer

: Avoid "Format All + Download" as it can erase your device’s unique IMEI and MAC address. It is often recommended to untick the Preloader option to reduce the risk of hard-bricking the device. Initiate Download : Click the button (green arrow). Connect the Device the BQ device completely. Connect it to your PC via USB. (Note: Using a USB 2.0 port