[LG Optimus L9 P760, P765, P768, P769] Math13:
Hi.

Need some help please.

Sorry for my english, but don't say good English and writing by google translator.

I am new to the forum, but I've read tens of posts.

He writes here, because I have a similar problem.

I have a LG L9 P769 phone purchased in the USA. My soft it: T-Mobile V20f.kdz

For several days'm trying to install the Bootloader & CWM Recovery. But I can't run it.

I decided so to install TWRP, the same as "thankyouxda", because I can see that at him he is acting.

But after the installation and the restart I receive the LG screen with the Security Error.

I recovered the phone with UpTestEX_BY_BRIDE_ 2014 program, but still I don't have Bootloader & CWM Recovery.

What am I doing wrong?!

Any program that installs Recovery at normal operating your phone and waiting for 50 minutes for me does not work. Everyone is only restarting my phone.

Only this method applies:

I run phone C/W Update (Vol Up + plug USB cable). I install the drivers and I type this command:

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: 9ed4cae7db55647eff3ed3cc853e28ece762f077
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 [Wersja 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. Wszelkie prawa zastrzeżone.

C:\fastboot\yours>

I have a mirror screen LG.

Now he is writing the command:

C:\fastboot\yours>fastboot devices
014FBECB02002010 fastboot

C:\fastboot\yours>fastboot flash recovery recovery.img
sending 'recovery' (6786 KB)...
OKAY [ 3.536s]
writing 'recovery'...
OKAY [ 1.756s]
finished. total time: 5.292s

C:\fastboot\yours>

But CWM does not start, any combination of the phone keys. I tried to install different cwm.img

So I downloaded the TWRP-769.zip, unpacked, moved twrp.img file to the directory of fastboot and I type:

C:\fastboot\yours>fastboot flash recovery twrp.img
.......

I'm sorry, but I did with this copy, but it looks like the CWM and writes OKEY, finished ...

It seemed, however, that everything went well. But the installed file is probably too large (10 240 kB)!?

Other CWM.img that I tried to install took only 6 500 - 6 900 kB.

What am I doing wrong that after reboot the phone getting the LG Security Error?

1) Should I install busyboox at first?

2) Should I install 20f_u-boot.zip first, to the mirror screen LG? How does it install?

3) What is the META-INF directory, and if it is needed for installation twrp.img?

Very much please help me.