Re-download the factory stock ROM verified for your exact device variant. The device cannot write to the NVRAM security block.
An unstable physical connection (cable older than 6 months, USB 3.0 port, extension hub) introduces noise into the data line. SPD protocol has zero error correction for handshake packets. One dropped bit = R400001 . spd flash tool r400001
Complete Guide to SPD Flash Tool R4.0.0001: Download and User Manual Re-download the factory stock ROM verified for your
Click the (Square/Stop icon) to safely exit the flashing cycle. SPD protocol has zero error correction for handshake packets
Avoid using external USB hubs or extension cables. Connect your device directly to your computer's main USB ports to ensure a stable connection during the flashing process.
The text box remained empty. Then, the cursor blinked.
Once the software recognizes the active com port, press the button (the play arrow icon).