ADXRS910 USER_LOCK and WR management (is not working)

Hi,

I want to lock the modifications of the sensor's register, setting the USER_LOCK register. But although I set that register to '1', the WR register data is not changed from 1 (Write enabled) to 0 (Only read). Also, the state vector (SV) is not changed from 00 "Initialization" to 01 "Running Mode". I have followed the sequence defined in the ADXRS910's datasheet.

Does anyone know how can be set this sensor to only read mode?

Thanks in advance,

Asier