Hello. I can confirm that the RUT955 with Firmware can measure current as expected.
The Lab setup consisted of a small 1/8W resistor, low precision 1 Kohm
A regulable power supply 0-30V
The RUT955 detected current with no problem in all the range from 0 to 24.1V at wich point it measure 20mA.
Please note that the resistor was calculated to provide 20mA at 20V but we didn't took in account the uncertainty of the non precision resistor and the temperature of the lab
Attached you will find the values obtained and the Lab Setup.
Please make sure that the analog input never exceed 30V. Otherwise it will get damage at some of the components that could lead to such failure.
If you think that the device is damaged from factory. Please feel free to contact your local distributor to request a guaranty procedure.