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Open a command prompt or terminal window in that folder. You can usually do this by holding Shift + Right Click in the folder and selecting or "Open Command Prompt here" . Step 2: Boot Into Fastboot Mode
If you see a serial number followed by "fastboot," you are ready to proceed. Step 3: Flash the crDroid Recovery Image crdroid recoveryimg install
This usually means your PC doesn't recognize the phone in Fastboot mode. Check your Device Manager for "Android Bootloader Interface" errors. Open a command prompt or terminal window in that folder