Error during upgrade: Initial heap size set to a larger value than the maximum heap size
[exec] [exec] Error occurred during initialization of VM
[exec] [exec] Initial heap size set to a larger value than the maximum heap size
This Java error indicates that the initial JVM heap (-Xms) was larger than the (-Xmx)
If you're missing the 'm' at the end, the value will be in bytes and this will make it smaller maximum value than the initial heap.
After fixing the values, retry the upgrade.