Hold down the button or the "Auto" button (this varies by revision). Connect it to your PC while holding the button.
Sometimes AliExpress sellers provide a QR code or Google Drive link for the latest updates. Step-by-Step Installation Guide 1. Prepare the Hardware dso2512g firmware
Search for "DSO2512G-Firmware-Archive" for older versions if you need to roll back. Hold down the button or the "Auto" button
You likely flashed a firmware version meant for a different hardware revision. Try flashing an older version or a "Universal" build. dso2512g firmware