[flashrom] Big problem after flash of SST SST25VF016B on HP Compaq 615

[Parallix]

I've a big problem. Of course, I made a backup of my old bios with flashrom -r oldbios.bin. Then I tried to flash my HP Compaq 615 with flashrom v0.9.1-r792 and got the following "warning":
 
No coreboot table found.
Found chipset "AMD SB700/SB710/SB750", enabling flash write... OK.
This chipset supports the following protocols: LPC,FWH,SPI.
Calibrating delay loop... OK.
Found chip "SST SST25VF016B" (2048 KB, SPI) at physical address 0xffe00000.
Flash image seems to be a legacy BIOS. Disabling checks.
Writing flash chip... Erasing flash before programming... Erasing flash chip... ERASE FAILED at 0x001c0000! Expected=0xff, Read=0xfc, failed byte count from 0x00000000-0x001fffff: 0x37386
ERASE FAILED!
FAILED!
ERASE FAILED!
FAILED!
Your flash chip is in an unknown state.
Get help on IRC at irc.freenode.net (channel #flashrom) or
mail flashrom at flashrom.org!
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DO NOT REBOOT OR POWEROFF!
 
After reading the flash contents with flashrom -r newbios.bin I compared the old bios with the new one. They differ. What can I now do?

Best,

Parallix