This arctile describes how to delete driver from the ESXi Bootbank. For example you want install NSX VIBs or other Kernel module the ESXi Image was to full with driver and no more space left on the 250 MB partition (ESXi 6.7 and earlier). In ESXi 7.0 and above the problem is solved. https://core.vmware.com/resource/esxi-system-storage-changes

I created a video how to solve this problem