There is also a hard reset (remove battery terminals and touch terminals together to remove residual charge in the computers - make sure you're connecting the cables, and nothings touching the battery!). Make sure to check the manual on how to properly disconnect and reconnect the battery.
This was used successfully after a water crossing where water had gotten into a sensor and caused the vehicle to lower on bumpstops (and effectively the chassis) on rocky ground, with no movement possible. It complely removed all the air from the airbags. After a hard reset, the fault was cleared and the car slowly rose to normal height again and was fine for the rest of the day. Getting rid of the fault that way (or clearing it with an OBD tool) would be my first option. Then I'd try Llams or an inflation kit, or some other method.
Cheers
Dan

