I have upgraded my ESXI and vCenter from 5.5 to 6.5, After upgrading to ESXI 6.5.0 build no. 5310538 I have applied a security patch which upgrade the ESXI to 6.5.0 build no 7388607.
So, is it possible I can roll back to ESXI 5.5 again? As I know I can rollback to previous version only that would be 6.5.0 build no. 5310538.
You can go only one step back if the configuration is available using Shift + R option during boot process. If you want to go back, only way I can think is to reinstall 5.5
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