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19 Upgrading to Dell EMC vSphere and vSAN version 7.0 | Technical white paper | 395
5 References
Upgrading ESXi hosts
Dell EMC VMware ESXi 7.x documentation
OMSA 9.4.0 and earlier versions are unsupported and will not allow install or upgrade to VMware ESXi 7.0
Dell EMC iDRAC Service Module (iSM) supported version for ESXi 7.0
vSphere 7 Upgrade Best Practices - Dell Knowledge Base article 78205
vmkapi Dependency error while Installing/upgrading to ESXi 7.0 – Dell Knowledge Base article 78389
Important information before upgrading to vSphere 7.0 -Dell Knowledge Base article 78487
Dell Knowledge Base article on upgrade failures