[Q] Hard brick, black screen and no s/w mode - LG Optimus L9 P760, P765, P768, P769

Hi I have a serious problem,
So the other day my lg l9 (P760) die completel. Ii try almost everything but my phone continue to had black screen, won't enter in s/w mode and won't hard reset.
Flash boot have this log at the end:
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 **
< waiting for device >
sending 'x-loader' (384 KB)...
OKAY [ 0.201s]
writing 'x-loader'...
FAILED (remote: partition does not exist)
finished. total time: 0.208s
sending 'u-boot' (1024 KB)...
OKAY [ 0.528s]
writing 'u-boot'...
FAILED (remote: partition does not exist)
finished. total time: 0.535s
Done
When i put it in usb the device connect and disconect continuosly. Only if i try to boot fastboot with vol+ pressed i can see the devices but the screen still black and after a couple of minute it disconnect. So i can't use the lg mobile tool. I try KDZ off-line and on-line procedure but the sw crah or do not recognize the phone.
Can someone help me please?

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Flash with fastboot u-boot and x-loader there are some tutorials for fastboot for our device.
LG L9-P760 /TapatalkVIP 4.7.3 /4.4.4KK AxxionKat 1.4.0 by @Xerdox

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Cytrus224 said:
Flash with fastboot u-boot and x-loader there are some tutorials for fastboot for our device.
LG L9-P760 /TapatalkVIP 4.7.3 /4.4.4KK AxxionKat 1.4.0 by @Xerdox
Click to expand...
Click to collapse
Thank you for your answer Cytrus224, but i try to flash with fastbot using this guide (http://forum.xda-developers.com/showthread.php?t=2411265) but flashbot log still the same as the post below.
Can you suggest me something or a better guide?
Thank you

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Had same problem yesterday, after changing philz touch to new artas182x twrp by Flashify flashing. Phone stock on LG logo, s/w not working. I used this method found on polish forum
http://forum.android.com.pl/f764/re-lock-bootloader-l9-328381
1. Download omap4boot
2. Download ics u-boot and x-loader.
3. Install fastboot drivers(all tutorials linked in post #1 in upper link)
4. Flash u-boot and x-loader.
5. Now you can turn again phone into s/w and flash stock roms
Sorry for my bad English
LG L9-P760 /TapatalkVIP 4.7.3 /4.4.4KK AxxionKat 1.4.0 by @Xerdox

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Cytrus224 said:
Had same problem yesterday, after changing philz touch to new artas182x twrp by Flashify flashing. Phone stock on LG logo, s/w not working. I used this method found on polish forum
1. Download omap4boot
2. Download ics u-boot and x-loader.
3. Install fastboot drivers(all tutorials linked in post #1 in upper link)
4. Flash u-boot and x-loader.
5. Now you can turn again phone into s/w and flash stock roms
Sorry for my bad English
LG L9-P760 /TapatalkVIP 4.7.3 /4.4.4KK AxxionKat 1.4.0 by @Xerdox
Click to expand...
Click to collapse
Doesn't work.. this is the result:
C:\omap4boot-for_optimus-v1.21>fastboot flash x-loader p1.bin
sending 'x-loader' (384 KB)...
OKAY [ 0.200s]
writing 'x-loader'...
FAILED (remote: partition does not exist)
finished. total time: 0.208s
C:\omap4boot-for_optimus-v1.21>fastboot flash u-boot p2.bin
sending 'u-boot' (1024 KB)...
OKAY [ 0.528s]
writing 'u-boot'...
FAILED (remote: partition does not exist)
finished. total time: 0.535s