Epson Perfection 1270 recognized, but not scanning

I edit the snapscan.conf file and add the firmware copied
from windows
driver.
Then i try 'scanimage -L', it found the epson 1270 scanner
in
'libusb:005:006'.
But when i try to scan the photo, it failed.

>From the debug log file, it seems something wrong when
download the
firmware.

The firmware file is copied from windows driver after i
installed it.

The debug log is 
============================================================
...
[snapscan] usb_cmd(0,0x8053d00,6,0x8061b40,0x8053e10 (120))
[snapscan] usb_cmd: cmdlen=6, datalen=0
[snapscan] usb_write: writing:  0x12 0x00 0x00 0x00 0x78
0x00
[snapscan] Written 6 bytes
[snapscan] usb_read: reading:  0xf9 0x00 0x00 0x00 0x00 0x00
0x00 0x00
[snapscan] Read 8 bytes
[snapscan] usb_read: reading:  0x06 0x00 0x02 0x02 0x49 0x00
0x00 0x00
0x45 0x50 ...
[snapscan] Read 120 bytes
[snapscan] usb_read: reading:  0xfb 0x00 0x00 0x00 0x00 0x00
0x00 0x00
[snapscan] Read 8 bytes
[snapscan] inquiry: exposure time: 0.0 ms
[snapscan] inquiry: ms per line: 0.000000
[snapscan] inquiry: G2R_DIFF: 0
[snapscan] inquiry: B2R_DIFF: 0
[snapscan] inquiry: Chroma offsets=0; Red=0, Green:=0,
Blue=0
[snapscan] inquiry: hardware config = 0x00
[snapscan] inquiry: bits per pixel = 14
[snapscan] inquiry: pixels per scan line = 0
[snapscan] inquiry: bytes per scan line = 0
[snapscan] inquiry: number of scan lines = 0
[snapscan] inquiry: effective buffer size = 0 bytes, 0 lines
[snapscan] inquiry: expected total scan data: 0 bytes
[snapscan] Looking up 32
[snapscan] Downloading /opt/esfw3e.bin
[snapscan] Size of firmware: 56958
[snapscan] snapscan_cmd
[snapscan] snapscani_usb_cmd(0,0x8071748,56968,0x0,0x0 (0))
[snapscan] atomic_usb_cmd(0,0x8071748,56968,0x0,0x0 (0))
[snapscan] usb_cmd(0,0x8071748,56968,0x0,0x0 (0))
[snapscan] usb_cmd: cmdlen=10, datalen=56958
[snapscan] usb_write: writing:  0x2a 0x00 0x87 0x00 0x00
0x00 0x00 0xde
0x7e 0x00
[snapscan] Written 10 bytes
[snapscan] usb_read: reading:  0xf8 0x00 0x00 0x00 0x00 0x00
0x00 0x00
[snapscan] Read 8 bytes
[snapscan] usb_write: writing:  0x02 0xdb 0x14 0x32 0xff
0xff 0xff 0xff
0xff 0xff ...
[snapscan] Written 56958 bytes
[snapscan] usb_read Only 0 bytes read
[snapscan] usb_read: reading:  0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00
[snapscan] Read 0 bytes
[snapscan] sane_snapscan_open: download_firmware command
failed: Error
during device I/O
scanimage: open of device snapscan:libusb:005:009 failed:
Error during
device I/O
[snapscan] sane_snapscan_exit
============================================================
=======
Can anybody help me? 
Thanks a lot!



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