Configuration of Nokia TMR420, HRU420, THR850 ?

[laforge]

Hi,

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 let me know.

Regards,
laforge