This video will show you how to update ESXi 7U1 to ESXi 7.0U2a using an ISO image to get your system up to the latest release. In this tutorial, the version of ESXi 7.0 installed is ESXi 7.0U1, but this article can be followed to upgrade any version of ESXi 7.0. If your ESXi host has access to the internet, there is a quicker method shown in this video – HOW TO: Update VMware ESXi 7.0U2 to ESXi 7.0U2a direct from VMware.
VMware has removed many older legacy processors (CPUs) from ESXi 7.0U2, and also storage and network controllers. Please check the VMware Hardware Compatibility Lists (HCL) here.
for more additional guidance and a step by step tutorial with screenshots, which supports this video, please see the following article, which this video is based on HOW TO: Upgrade VMware ESXi 5.5 to VMware ESXi 6.0 using an ISO image
It is not recommended to install ESXi 7.0 on USB or SD cards because of higher write I/O, and the SD cards are currently suffering because they are not higher endurance. Problems have been found in the wild.
It is technically still supported; eventually, this may filter down through the server vendors…
Some additional information regarding the use of USB and SD cards with VMware vSphere Hypervisor 7.0 (ESXi 7.0) and installations.
Installing ESXi on a supported USB flash drive or SD flash card (2004784)
vSphere 7 – ESXi System Storage Changes
VMware vSphere 7.x on Dell EMC PowerEdge Servers Getting Started Guide
Virtual SAN Considerations When Booting from a Flash Device
VMFS-L Locker partition corruption on SD cards in ESXi 7.0 (83376)
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