Hi, Im programing a MX MX25L1606E chip with a ch341a_spi programmer in ubuntu 18.04 with flashrom utility. Im check all the connections and are correctly. when im erase the chip receive this error

Erasing and writing flash chip... FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from 0x00000000-0x0000ffff: 0xff44
ERASE FAILED!
Reading current flash chip contents... done. Looking for another erase function.
FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from 0x00000000-0x0000ffff: 0xff44
ERASE FAILED!
Reading current flash chip contents... done. Looking for another erase function.
FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from 0x00000000-0x001fffff: 0x15efae
ERASE FAILED!
Reading current flash chip contents... done. Looking for another erase function.
FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from 0x00000000-0x001fffff: 0x15efae
ERASE FAILED!
Looking for another erase function.
No usable erase functions left.

whats is the problem?? thanks