Wanting to unlock Sagem my401c, USB device not recognized - GSM-Forum

Zacchi4k · 04-11-2017, 20:09

I want to unlock my Sagem my401c, so I soldered the necessary wires on the board. However, as soon as I power on the phone and connect it to the PC, I get the USB device not recognised message:

The device shows up in task manager as "Unknown USB device (device descriptor request failed)"

Here's my setup:

Why is this happening? Can someone help me?

The PC's got Windows 10 1607 x64

allumts · 04-12-2017, 11:12

Try with Win 7 these are Old phones and can be win 10 not detect it.

Br
allumts

Raklm · 04-12-2017, 11:49

AS far I remember, for this phone you need rs232 interface not usb. (native com1 or ftdi based)

allumts · 04-14-2017, 10:35

Yes, full agree with @Raklm, i've cecked in my old HD and appoint and this phone Not work with USB interface....

Br
allumts

Zacchi4k · 04-16-2017, 08:16

Quote:

Originally Posted by Raklm

AS far I remember, for this phone you need rs232 interface not usb. (native com1 or ftdi based)

Ok, so if I get an old PC with a COM port (I've got two), then I get a COM cable, strip one side of it and connect them Tx, Rx and GND wires on the phone's board and connect the other side to the PC, can I unlock it then?

04-11-2017, 20:09	#1 (permalink)
Zacchi4k Junior Member Join Date: Dec 2015 Location: Italy, Milan Posts: 16 Member: 2505299 Status: Offline Thanks Meter: 0	Wanting to unlock Sagem my401c, USB device not recognized I want to unlock my Sagem my401c, so I soldered the necessary wires on the board. However, as soon as I power on the phone and connect it to the PC, I get the USB device not recognised message: The device shows up in task manager as "Unknown USB device (device descriptor request failed)" Here's my setup: Why is this happening? Can someone help me? The PC's got Windows 10 1607 x64

04-12-2017, 11:12	#2 (permalink)
allumts No Life Poster Join Date: Apr 2011 Age: 58 Posts: 16,408 Member: 1564612 Status: Offline Thanks Meter: 12,343	Try with Win 7 these are Old phones and can be win 10 not detect it. Br allumts

04-12-2017, 11:49	#3 (permalink)
Raklm No Life Poster Join Date: Aug 2001 Location: Roma Age: 49 Posts: 4,481 Member: 5926 Status: Offline Thanks Meter: 275	AS far I remember, for this phone you need rs232 interface not usb. (native com1 or ftdi based)

04-14-2017, 10:35	#4 (permalink)
allumts No Life Poster Join Date: Apr 2011 Age: 58 Posts: 16,408 Member: 1564612 Status: Offline Thanks Meter: 12,343	Yes, full agree with @Raklm, i've cecked in my old HD and appoint and this phone Not work with USB interface.... Br allumts