Nokia TETRA device configuration ?

Hello, does anyone here has experience with the configuration of some older Nokia TETRA devices like the TMR420, HRU420 or THR850 ? The manufacturer does no longer support them so there seems to be no official way to get the required information. If you can help, please contact me privately. Thanks and best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de