[sane-devel] Firmware upload in acer-benq s2w 3300U

[Juan Jesus Gonzalez]

I use linux mandrake 9.0 , downloaded an compiled sane-backends
 1.0.9 with the latest scanimage souce. If I use the scanner in 
windows and then switch to linux, it works fine; but no chance if I
 do it directly after powering down the scanner. The debug output
is:
[sanei_debug] Setting debug level of snapscan to 2.
[snapscan] usb_write Only 0 bytes written
[snapscan] mini_inquiry: snapscan_cmd command failed: Error during device I/O
[snapscan] snapscani_check_device: mini_inquiry failed with Error during 
device I/O.
[snapscan] usb_read Only 0 bytes read
and this is my proc/bus/usb/devices:
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc= 17/900 us ( 2%), #Int=  1, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=e400
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  6 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=ff(vend.) Sub=ff Prot=ff MxPS= 8 #Cfgs=  1
P:  Vendor=04a5 ProdID=20b0 Rev= 1.20
S:  Manufacturer=Color
S:  Product= FlatbedScanner 22
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=usbscanner
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=   8 Ivl=0ms
E:  Ad=83(I) Atr=03(Int.) MxPS=   8 Ivl=16ms
Also I have a soft link /dev/scanner0 < /dev/usbscanner.
Thank you in advance for any reply and sorry for my bad english.