Does this help:
https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/X240-USB-Boot/td-p/1615358
Type: Posts; User: philo
Does this help:
https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/X240-USB-Boot/td-p/1615358
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