verifying works, writing no device found

Hi,

i have a problem with flashing a blank new bios chip. It´s a Macronix MXIC MX 25L3206E on a lenovo t430 mainboard. I successfully flashed the same mainboard with the orginal bios rom. Since i started using flashrom on a desolderd new chip the verifying process works 100 % at 20 try´s but the writing process failed because there is no EEPROM/flash device found. The /WP and /HOLD pin are high.
For any help i would be thankful.

Regards,
Max