Troubleshooting Tip: Firmware upgrade failing with the error 'scsi_print_error[***]scsi error'

[nevan]

Description	This article describes the circumstances behind the error 'scsi_print_error[***]scsi error' while upgrading or loading firmware with TFTP where firmware upgrade or loading fails or gets stuck with correspondent errors in console log.
Scope	FortiGate.
Solution	While loading the firmware or upgrading with the TFTP after the flash format with the article Technical Tip: Formatting and loading FortiGate firmware image using TFTP the following error can appear in the console: Ver:05000006 Serial number:FG1KXXXX803304 RAM activation CPU(00:000306e4 bfebfbff): MP initialization CPU(01:000306e4 bfebfbff): MP initialization CPU(02:000306e4 bfebfbff): MP initialization CPU(03:000306e4 bfebfbff): MP initialization CPU(04:000306e4 bfebfbff): MP initialization CPU(05:000306e4 bfebfbff): MP initialization CPU(06:000306e4 bfebfbff): MP initialization CPU(07:000306e4 bfebfbff): MP initialization CPU(08:000306e4 bfebfbff): MP initialization CPU(09:000306e4 bfebfbff): MP initialization CPU(0a:000306e4 bfebfbff): MP initialization CPU(0b:000306e4 bfebfbff): MP initialization Total RAM: 16384MB Enabling cache...Done. Scanning PCI bus...Done. Allocating PCI resources...Done. Enabling PCI resources...Done. Zeroing IRQ settings...Done. Verifying PIRQ tables...Done. Boot up, timeout exit! AhciIdentifyDevice: SCSI inquiry command failure. set DMA transfer feature error! timeout exit! scsi_print_error[1150]scsi error boot device capacity: 0MB. Press any key to display configuration menu... ............................. Invaild port number 255 scsi_print_error[1150]scsi error You must format the boot device After the message 'You must format the boot device', if the device is hanging and the SCSI error 'scsi_print_error' is visible, reboot the unit immediately. Possible reasons for the error include: The upgrade may have been interrupted (e.g., power cut), leaving the boot partition unreadable, which can lead to a corrupted or missing boot flash. Internal storage or hardware failure (flash/SSD). An incompatible firmware image was flashed, meaning the device may fail to initialize storage properly. There could be BIOS/firmware corruption or a hardware fault. For example. the 'Invalid port number 255' system is probing for a nonexistent storage port. When FortiGate cannot detect or access its boot storage (flash/SSD), the upgrade fails and the system cannot boot. The most likely cause is corrupted or failed flash memory. If the same error appears after a hardware reboot, create a ticket with Fortinet TAC to check whether the unit requires an RMA.