Recovering Intel® Edison if Password is Unknown
Try this solution suggested by msg4alex in Recovering from a bad Linux* image.
This method recovers your Intel® Edison if the password is unknown. Flashing the image deletes all data from Intel Edison, including content and settings.
Prerequisite: Set up the Intel Edison board drivers following Flashing Edison (wired) - Windows step 1 and 2.
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Download the Intel Edison Yocto complete image from Intel Edison - Software Downloads.
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Connect two USB cables and power supply to the Intel® Edison breakout board, or the Intel Edison board with Arduino* Expansion.
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Extract the Edison Yocto complete image zip file to Intel Edison volume in computer.
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Open a serial connection using Putty or other client.
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Reboot the Intel Edison leaving the serial connection opened. When you start to see the boot up message press any key to stop autoboot.
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Type run do_ota, the flashing process takes 2-3 minutes and Edison will reboot a couple of times.
Once the flashing process completes the Intel Edison login prompt appears. Type in root and you should have access to Intel Edison.