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# Firstly'''Only''' Raspberry Pi OS ('''Bookworm''') supports PCIe, Raspberry Pi OS bullseye is NOT supported, you can read refer to https://www.raspberrypi.com/software/operating-systems/#Make sure that your OS configuration is completely correct: refer to the tutorial:[[NVMe SSD boot with the Raspberry Pi 5]] (Continuously updating)#Read [https://geekworm.com/community/forum/topic/120764/geekworm-x1001-for-raspberry-pi-5 this post] to get some help;# Make sure the SSD type you use is correct, only support <span class="tb_red">M.2 NVME (Sata) Key-M SSD '''</span>NOT support''' M.2 NGFF Key-B SSD. Refer to the following diagram (click it to zoom out): [[File:Supported-SSD-1.jpg|100px]]# Check if Make sure the FFC FPC cable is fully inserted. Is the HAT tightly firmly connected? We recommend you to send us the FFC connection schematic as wellPI 5, this is very important.# '''Only''' Raspberry Pi OS ('''Bookworm''') supports PCIeFor X1003 shield, Raspberry Pi OS bullseye make sure the FPC cable direction is NOT supported, refer to https://www.raspberrypicorrect also.com/software/operating-systems/# Although you can also boot from a SD card, Pi OS is required for the NVMe SSD to boot, DON'T forget Flash OS onto into NVMe SSD.# If you're flashing a fresh Pi OS into NVME SSD , DON'T forget to '''ENABLE PCIe''' to NVME SSD.# Run the '''lspci''' and'''lsblk''' command to check the NVMe SSD is recognized.# Add '''''PCIE_PROBE=1''''' to the eeprom, (Run '''sudo rpi-eeprom-config --edit''' command, then add this line, then press CTRL+O to write change to file, press CTRL+X to exit, then reboot)# <span class="tb_red">Update the bootloader firmware to the last verson, refer to [[How to update eeprom firmware]], this is very important!!!</span>And finally be sure to run the command ''vcgencmd bootloader_version'' to check if your upgrade was successful!# For [[X1003]]shield, if an error occurs, replace the FFC cable to test.# If your SSD is old and has a '''DOS partition''', delete the DOS partition and repartition the SSD (feedback from buyer)# Contact us at email: support@geekworm.com