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Cannot write to Memory on STM32F071V8

Question asked by kt1024 on Jan 28, 2016
Latest reply on Jan 28, 2016 by Clive One

I get the following error when trying to write to memory with the latest STLink Utility:

12:09:09 : ST-LINK SN : 48FF6E064967535727520587
12:09:09 : ST-LINK Firmware version : V2J25S4
12:09:09 : Connected via SWD.
12:09:09 : SWD Frequency = 0,9 MHz.
12:09:09 : Connection mode : Normal.
12:09:09 : Device ID:0x448
12:09:09 : Device flash Size : 64KBytes
12:09:09 : Device family :STM32F072xx/F078xx
12:09:42 : Internal command error
12:09:42 : Error occured during program operation!
12:09:42 : Programming error @: 0x00000000

Boot0 is pulled to ground with  a 10k resistor I hope this is enough.

I can write single Words to address 0x08000000 but not to address 0x00000000. I could imagine that something is blocking my write attempts, but it doesn't seem to be any FLASH protection.

If somebody could point me to the right direction I would be glad.