AES256 prior to R2.4
Shortly before the release of R2.4, the standards relevent to AES encryption in DMR were finalised and some changes were made in the software to allow AES256 in MOTOTRBO radio to work with AES256 in other makes of radios. This also meant that radios, with firmware older than R2.4, would not work with radios that have firmware newer than R2.4.
There are two ways to resolve this:
- Upgrade the firmware in all radios to something newer than R2.4 .
- In radios with AES enabled, there is a tick box to allow legacy (Motorola) AES support.