How to flash UEFI BIOS with iPXE?

[engineer7]

I configured the BIOS to boot to the UEFI Built in Shell and placed the .efi on a USB drive. Then at the prompt enter:

fs1:
Shell.efi
Running this starts a new shell successfully

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Update: I was able to run the chain Shell.efi command successfully now. It might have been a network hiccup on the first run or two.

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Thank you! After successfully running initrd and chain I'm greeted with a working shell.

However, I'm trying to edit/rename files in the shell which yields a "cannot move to or from a read-only file or directory FS2:\fdt.efi"

Is it possible to enable read/write access on FS2:\ in the shell?