SmartSnippet verify error

Hello,

when trying to program&verify flash i constantly get verification errors

[ERROR @16-04-05 17:35:39] SPI FLash memory verification failed. Error at address 0x06

There is no difference between testing via jtag or uart+spi nor testing DevKit vs. custom product.
Any hint how i can achieve programming and verification ?

Thx

Fabian