[LG Optimus L9 P760, P765, P768, P769] saboteaur:
I'm having the same issue. I flashed fastboot and looks like it did it, but if I try to boot it it just won't go.. I have followed all the post regarding the issue but unfortunately nothing seems to be working for me.

ECHO is off.

Plug USB cable

wait 4 seconds and put battery back in.

waiting for OMAP44xx device...

Device descriptor:

bLength = 18

bDescriptorType = 1

bcdUSB = 528

bDeviceClass = 255

bDeviceSubClass = 255

bDeviceProtocol = 255

bMaxPacketSize0 = 64

idVendor = 451

idProduct = D00F

bcdDevice = 0

iManufacturer = 33

iProduct = 37

iSerialNumber = 0

bNumConfigurations = 1

reading ASIC ID

usb_write 4

usb_read 81

[*] read 0 bytes

NumOfSubblocks: 0x5

Subblock ID: 0x1

Subblock Size: 0x5

CH enabled: 0x7

ROM revision: 0x4

Checksum Subblock: 0x15

CHIP: 4430

IDEN: d8a7f2b92c56cf93c5d33b11b7add3dce9718e3d

MPKH: 5f4092eccddf90fa43f546adf89508b31b9c74795e9516194c0ea6412fdcb7f6

CRC0: 9c669ad9

CRC1: 682adccf

sending 2ndstage to target... f0030002

usb_write 4

usb_write 4

wait 5-lelelel...

[*] msg size = 4

usb_write 21552

[*] data size = 21552

usb_close

Reopen usb...

Device descriptor:

bLength = 18

bDescriptorType = 1

bcdUSB = 528

bDeviceClass = 255

bDeviceSubClass = 255

bDeviceProtocol = 255

bMaxPacketSize0 = 64

idVendor = 451

idProduct = D00F

bcdDevice = 0

iManufacturer = 33

iProduct = 37

iSerialNumber = 0

bNumConfigurations = 1

waiting for 2ndstage response...

usb_read 4

usb read = aabbccdd

accepted 2ndstage response

sending image to target...

size = 246272

usb_write 4

usb_write 246272

** Done **

Microsoft Windows XP [Version 5.1.2600]

(C) Copyright 1985-2001 Microsoft Corp.

C:\fastboot\bin>fastboot.exe devices

C:\fastboot\bin>fastboot.exe devices

If I try either option 5 or 7, I get the same error:

ECHO is off.

Plug USB cable

wait 4 seconds and put battery back in.

Device descriptor:

bLength = 18

bDescriptorType = 1

bcdUSB = 528

bDeviceClass = 255

bDeviceSubClass = 255

bDeviceProtocol = 255

bMaxPacketSize0 = 64

idVendor = 451

idProduct = D00F

bcdDevice = 0

iManufacturer = 33

iProduct = 37

iSerialNumber = 0

bNumConfigurations = 1

reading ASIC ID

usb_write 4

AdbWriteEndpointSync returned 0, errno: 1167

usb_read 81

[*] read 0 bytes

NumOfSubblocks: 0x45

Subblock ID: 0x0

Subblock Size: 0x31

CH disabled: 0x34

ROM revision: 0x0

Checksum Subblock: 0x63

CHIP: 3300

IDEN: 003000390031002d003100340031003700300030

MPKH: 3300330033002d003500300030005c0044007200690076006500720043006100

CRC0: 00650000

CRC1: 00000000

sending 2ndstage to target... f0030002

usb_write 4

AdbWriteEndpointSync returned 0, errno: 1167

usb_write 4

AdbWriteEndpointSync returned 0, errno: 1167

wait 5-lelelel...

[*] msg size = 4

usb_write 21552

AdbWriteEndpointSync returned 0, errno: 1167

[*] data size = 21552

usb_close

Reopen usb...

Device descriptor:

bLength = 18

bDescriptorType = 1

bcdUSB = 528

bDeviceClass = 255

bDeviceSubClass = 255

bDeviceProtocol = 255

bMaxPacketSize0 = 64

idVendor = 451

idProduct = D00F

bcdDevice = 0

iManufacturer = 33

iProduct = 37

iSerialNumber = 0

bNumConfigurations = 1

waiting for 2ndstage response...

usb_read 4

usb read = 2430010

unexpected 2ndstage response ***** <-----------------------

< waiting for device > ***** <-----------------------

.. and does not do anything more. I also tried using S/W upgrade mode however the KDZ tool does not recognize it no matter what. I doesn't even detect it as LG Mobile modem.

Any ideas?:rolleyes: