Hi Kevin, Can you please supply the IC markings of the 10 failing units? Are they distinctive in that they are from a different lot as compared to the other 240 devices? Have any hardware changes been made to the USB section of these boards as compared to those from previous years? And you can confirm that BSL mode is either not entered or operating successfully after a BOR reset while the PUR pin is held high? BSL Version 00.07.88.38 is used for Rev K parts manufactured up to May 2015, 00.08.88.39 for more recent Rev K devices. The latest RAM_BSL should also be programmed, it would be worthwhile to read the memory contents 0x1000 to 0x1800 and 0x2500 to 0x3400 of these devices. I do not know of a BSL self test that can be implemented. Regards, Ryan
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