You must install the GGSetup (Gordon's Gate) drivers. Without these, your PC will not recognize the Vivaz in "Flash Mode."
Once the tool says "Operation Finished," unplug the phone and pull the battery out. Reinsert it and power the device on. Troubleshooting Common Issues dbx phone lock tool download vivaz hot
Since the Sony Ericsson brand has been defunct for years, finding the original official support tools is difficult. You will likely need to rely on trusted GSM hosting forums. You must install the GGSetup (Gordon's Gate) drivers
If the phone is stuck on the logo, the DBX tool can perform a "Hard Reset" to factory settings. dbx phone lock tool download vivaz hot