I have the DK52DK2 starter kit in hand. I'm following the "ANT SoC Module Starter Kit User Manual
N5DK1 & D52DK1" D00001678 Rev 1.0 (I didn't find a dedicated user manual for D52DK2)
While following the instructions, trying to load the the firmware from Keil µVision (ver 18.104.22.168) to the module according to section 3.9 in the user manual, I get the message: Error: Flash Download Failed - Cortex M4
Looking in the Nordic Devzone, seems like the application is trying to write on the SoftDevice. I tried to reconfigure the Target Memory Areas in Keil according to section 6 in the user manual but this didn't help.