Please check the Serial Number (SN) located on the back of your machine.
If your SN falls within this range 500DT00001-500DT00100
Article:https://deteckusa.reamaze.com/articles/dt500-cis-calibration
If your SN falls within this range 500DT00100 onwards
Article:https://deteckusa.reamaze.com/articles/dt500c-cis-calibration