The following keys combination entered just after attempt to main menu allow to run this procedure:

*#06#

1. IPUI is always displayed as 5 Byte long Hex-Code.
2. Digit  1 -  5: Working counter hours
   Digit  6 - 10: working counter when last reset has been performed
   Digit 11 - 15: working counter when last successful FW update was performed
   Digit 16 - 17: number of unsuccessful FW downloads
3. Digit  1 - 3: Variant
   Digit  4 - 6: Software version
   Digit  7 - 8: Revision
   Digit  9 - 11: User_ID
4. Internal product name
5. Flash Image version
6. SAP ID