I think I was a little flustered.
After reading the xflash Cmd-Line Manual, the reason for this behaviour seems quite clear.
xflash --key disable access to OTP memory.
With xflash --key --enable-otp it works all how it should :)
Sorry, I think my question was unclear.You can do xburn --read --target-file=xxx.xn to see the entire contents of the OTP and confirm this is the case.
Is it possible to read out the OTB memory to a file.
Something like:
xburn --target-file xxx.xn --read -o otb-dump.txt
Best Regards,
Sebastian