05-06-2019 08:27 PM
Please refer below steps to check if you can find boot option mode on your server or not.
1. Press F1 when system booting to enter System Configuration and Boot Management main page.
2. Select Boot Manager
3. Select Boot Modes
4. You can adjust boot mode from System Boot Mode option
05-07-2019 07:37 PM - edited 05-07-2019 07:43 PM
May I ask what is your purpose to boot up from legacy mode?
You can find more information about legacy boot on SR250 from below links.
05-30-2019 06:46 PM
May I ask if your problem have been solved or not?
I found the article Hard disk boot priority does not show Legacy boot device in Legacy boot mode - Lenovo ThinkSystem for your reference.
If possible, please proivde test steps or screen shots about the issue for us.
06-10-2019 08:21 PM
My colleague replied about the steps used to change the system boot mode to Legacy through the UEFI setup page. That means the server firmware does support system to boot from Legacy mode.
Could you find the boot mode option through UEFI setup utility?
If you can find the option and set the system boot mode to "Legacy mode", could you please elaborate more detail about what devices cannot do a legacy boot or provide any screenshot for the failure screen so that we can understand the issue you encountered?