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  1. Problem solved. Zybo is production silicon. It was all about to solder a battery to J15 on the Zybo board to get a known BBRAM state.
  2. Hi, I'm working on a project where I need to program the board using encrypted FSBL Boot Image. I have already described my issue in detail in Xilinx community forum: https://forums.xilinx.com/t5/ACAP-and-SoC-Boot-and/FSBL-not-loaded-from-QSPI-flash-after-encryption-switched-on/td-p/1173437 I prepared a working, but unencrypted solution. Now it looks like the Zybo Z7-20 Zynq is not a production silicon and I will not be able to finish the project. https://www.xilinx.com/support/answers/47565.html Can you confirm my suspectation? I have checked the XC7Z020 IDCODE and it i