Why does Vendor Authorized Boot (VAB) certificate authentication failed in SDM? - Why does Vendor Authorized Boot (VAB) certificate authentication failed in SDM? Description During the Second-Stage Bootloader (SSBL), you may encounter an intermittent timeout while transferring the initial 32‑word block of the VAB certificate command Error message displayed: #ret = 0x000007ff, resp = 0x00000000, resp_len = 1 #VAB certificate authentication failed in SDM #### ERROR ### Please RESET the board ### Resolution To avoid this problem, upgrade the socfpga_v2.12.1 ( socfpga_mailbox.c ) An ATF patch for socfpga_v2.12.1 is available to fix this problem : Download and install patch mbox.patch from the attachment below. This problem is scheduled to be resolved in a future ATF released Custom Fields values: ['novalue'] Troubleshooting 15018709061 novalue ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 25.1.1 ['Agilex™ 5 FPGAs and SoCs', 'Agilex™ 7 FPGAs and SoCs', 'Agilex™ 3 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']