Hello,
Please try using the recent MFG
http://www.nxp.com/webapp/Download?colCode=IMX6_L4-1-15_2-0-0_MFG-TOOL&appType=license&location=null...
Also, please check if the i.MX6 S board is configured for serial (USB) boot mode ;
BOOT_MODE[1:0] = 01 (Serial Downloader).
Have a great day,
Yuri
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