Ensure the phone is completely powered off before holding the boot key and plugging it in. If Volume Down doesn't work, try holding both Volume Up and Volume Down together.
The (model 8030 ) generally runs on Android 11 with ZTE's custom interface. Whether you are looking to fix a "brick," remove a forgotten screen lock, or simply update your device, 1. Official Over-the-Air (OTA) Updates Firmware ZTE Blade V30 Vita
If you are still encountering a problem after trying these basic troubleshooting steps, you may need to perform a manual "flash" of the firmware. Ensure the phone is completely powered off before