Werner Meier wrote:
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I'm not sure about the RB2, but I had strange problems with the CC01 using blocks of 128byte. According to Atmel support, I had to use 16byte blocks, then everything was fine.


Thanks for your hint !
Actually I have not tried the page prog function because I have a memory limit to the first 0x800 bytes for my complete update code plus usb code and have only a few bytes left...
But since Atmel has also no idea whats going wrong I will give your idea a try.

Thomas