# Switching boot back to Legacy
<a name="migrate-topic-bios"></a>

RHEL 7 and CentOS 7 require that the boot mode for the appliance is BIOS. If you have changed the boot mode to UEFI to support RHEL 9, you can change the boot mode from UEFI back to BIOS (Legacy mode).

**Topics**
+ [Switching to Legacy on a Dell](migrate-topic-bios-dell.md)
+ [Switching to Legacy on a SuperMicro](migrate-topic-bios-supermicro.md)