fs0: cd EFI\Microsoft\Boot bootmgfw.efi Place the vendor’s .cap or .bin firmware file on a USB drive and run:
load fs0:\EFI\DRIVERS\NvmExpressDxe.efi map -r Cause: Changes in for , if syntax. Solution: Refer to the UEFI Shell 2.6 specification document for new conditional structures. Shell hangs on PCI enumeration Cause: Faulty add-in card (GPU, RAID controller). Solution: Remove suspected hardware, or use pci -i to disable problematic devices. Comparing Version 260.512.2021 with Other Common Shells | EFI Shell Version | Year | Notable Features | Typical Hardware | |------------------|------|------------------|------------------| | 2.0 | 2012 | Limited NVMe, no HTTP boot | Old Intel motherboards | | 2.4.0.112 | 2017 | Basic Secure Boot | Dell PowerEdge R740 | | 260.512.2021 | 2021 | Full GPT, NVMe 1.4, HTTP(S) boot, TPM 2.0 | Supermicro X12, X13; Intel Atom P5900 | | 2.9.x | 2024 | USB 4 support, Rust UEFI apps | Latest AMD/Intel platforms | efi shell version 260 512 2021
| Command | Purpose | |---------|---------| | map -r | Lists all mapped drives (fs0:, blk0:, etc.) | | fs0: | Switch to the first FAT32 filesystem | | ls | List directory contents | | bcfg boot dump | View current boot entries | | bcfg boot add 1 fs0:\EFI\BOOT\BOOTX64.EFI "My OS" | Add a new boot entry | | dmem | Display memory contents (debugging) | | dh | Dump all UEFI device handles | | drivers | List loaded UEFI drivers | | reconnect -r | Reconnect all UEFI drivers | | ver | Show EFI Shell & UEFI firmware version | | help -b | List all commands with pagination | fs0: cd \EFI\ubuntu grubx64.efi Or using the boot manager: fs0: cd EFI\Microsoft\Boot bootmgfw
devices -b pci memmap bcfg boot rm 3 5. Secure Boot Key Management setvar PK -guid ... -bs -rt -nv = 0x... Common Issues and Troubleshooting "Command not recognized" error Cause: You are using a minimal UEFI shell without full command support. Solution: Version 260.512.2021 is generally full-featured, but some vendors strip commands for size. Try compiling the complete EDK II shell. "Cannot open volume" when accessing NVMe Cause: Missing NVMe driver. Solution: Load it manually: Solution: Remove suspected hardware, or use pci -i
| Component | Interpretation | |-----------|----------------| | | The UEFI Shell application (typically Shell.efi ). | | version 260 | The major/minor revision of the UEFI Shell specification (2.60). This aligns with the UEFI 2.8 specification. | | 512 | Often indicates the internal build number or a specific feature flag (e.g., command set size, memory pool identifier, or vendor-specific patch level). | | 2021 | The year of compilation or release (likely 2021). |
Introduction In the world of enterprise computing, embedded systems, and IT diagnostics, few tools are as powerful—and as misunderstood—as the EFI Shell . Among the various iterations released over the years, one specific build has garnered attention among firmware engineers and system administrators: EFI Shell Version 260.512.2021 .
fs0: flash.nsh Check memory mapped I/O or PCI device handles: