Taken from the rangerover_easunlock_suite_win32_10-20-08 PDF help file;
Rules: The EAS computer has internal programmatic limits to how far you can change each of the stored height values. For example if you tried to configure the access height as high as the extended profile, the EAS computer would not allow that change. When the internal programmatic limits have been exceeded, the EAS will go into Hard Fault and reset all of the stored height profiles to a factory default. The limits to the Virtual number are listed below. If they are exceeded, the EAS will go into fault and you will have to start all over again with the process.
Front Rear
Extended 120-180 105-150
Standard 95-150 85-130
Low 75-140 75-120
Access 50-110 50-100