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Switching to legacy PXE boot on x3550M3 (+others)

1. Press F1 to go into System settings
2. Got to Boot manager and pick Add boot option
3. Add Legacy only
4. Repeat pick of Add boot option
5. Add PXE Network
6. Pick Change boot order'
7. Move Legacy only option above PXE Network
8. Commit changes and reboot
9. The system will boot PXE in legacy mode automatically, If you want to boot from PXE network manually after pressing F12, select Legacy only not PXE Network.
10. You may want to revert the boot order afterwards

References

• http://honglus.blogspot.co.uk/2012/05/force-legacy-mode-pxe-in-ibm-system.html