[LG Optimus L9 P760, P765, P768, P769] jaaaaaan:
- flashed your boot.img:

- still security error

- flashed both your x-loader.img and the recovery.img you provided:

- still security error

- tried to get into the LG recovery mode anyway:

- YES! ADB Interface in device manager!

- Tried to flash V10A using LGMobile Software Tool (was the only image I ever managed to get offline):

- used "emergency" phone mode

- went through "ANALYSIS" and "DOWNLOAD" without problems...

- ...but now is stuck at 4% of UPDATE for 10 minutes now already :(

- (log appended)

I'm still having the update open. Should I pull the plug? What to try next? Try again? Different PhoneMode?

Again, thank you so much for your support!

22:26:07 : [C:\LGMobileUpgrade] Try to delete folder
22:26:07 : Start Date : 2013-03-29 22:26:07
22:26:07 : ---------- QM Testmode ---------
22:26:07 : ***** Check Tool Version *****
22:26:07 : Tool version : 1.5.4.8
22:26:07 : UpgradeDLL version : 1.2.6.7
22:26:07 : Current Dir : C:\ProgramData\LGMOBILEAX\B2C_Client
22:26:07 : LGE USB Driver Version :
22:26:07 : Android PDLV Version :
22:26:07 : Android NDLV Version :
22:26:07 : ******************************************
22:26:07 : [C:\ProgramData\LGMOBILEAX\Phone] Try to delete folder
22:26:07 : SetEmerModeAT()
22:26:07 : _IsConnectedPhone Call
22:26:23 : _IsConnectedPhone(1)
22:26:23 : 0 - NotConnected.
22:26:23 : 1 - Normal connect success
22:26:23 : 2 - Emergency connect success
22:26:25 : _IsConnectedPhone Call for SmartPhone
22:26:25 : _IsConnectedPhone(0)
22:26:25 : 0 - NotConnected.
22:26:25 : 1 - Normal connect success
22:26:25 : 2 - Emergency connect success
22:26:25 : PhoneÀÌ Notconnect »óÅÂÀÌ¸ç Port¸¦ ÀâÁö ¸øÇß°í Åë½Å ÇÒ¼ö¾ø´Â »óÅÂÀÓ.
22:26:25 : ¾÷±×·¹ÀÌµå ÇÏ´Ù°¡ ½ÇÆÐÇÑ ±â·ÏÀÌ PC¿¡ ³²¾ÆÀÖÀ¸¸ç Æù°ú Åë½ÅÀ» ÇÒ¼ö ¾ø±â ¶§¹®¿¡
22:26:25 : È¯°æºÐ¼® ´ë½Å ¸¶Áö¸·¿¡ ¾÷±×·¹ÀÌµå¸¦ ½ÃµµÇÑ °ªÀ» °¡Áö°í ¾÷±×·¹ÀÌµå ½Ãµµ¸¦ ÇÔ.
22:26:25 : È¯°æ ºÐ¼® ºÎºÐÀº Pass ÇÏ°í File download / Decrypt °úÁ¤À¸·Î PassÇÔ.
22:26:25 : *****CheckOS Start********
22:26:25 : Microsoft_Windows_XP_Professional_Service Pack 3
22:26:25 : ÀÎÁõ °Ë»ç ÆÄ¶ó¸ÞÅ¸ - ESN_IMEI : , Model :
22:26:25 : Phone type Compare start
22:26:26 : ****************CheckAndDownload********************
22:26:26 : ******Extract Start C:\Users\Jan\Desktop\P760\root\rollback\V10A_00.kdz*****
22:26:26 : Model Dll Dir(C:\ProgramData\LGMOBILEAX\Phone\)
22:26:26 : File Size = 532966984
22:26:38 : Extract kdz file Success.
22:26:47 : Extracted C:\ProgramData\LGMOBILEAX\Phone\\V10A.wdb\n
22:26:47 : WDB(or DZ) FullPath(C:\ProgramData\LGMOBILEAX\Phone\\V10A.wdb)
22:26:53 : Extracted C:\ProgramData\LGMOBILEAX\Phone\\LGP760.dll\n
22:26:53 : Model dll FullPath(C:\ProgramData\LGMOBILEAX\Phone\\LGP760.dll)
22:26:53 : NNNNN WDB FullPath(C:\ProgramData\LGMOBILEAX\Phone\V10A.wdb)
22:26:53 : NNNNN Model dll FullPath(C:\ProgramData\LGMOBILEAX\Phone\LGP760.dll)
22:26:53 : Extract End C:\Users\Jan\Desktop\P760\root\rollback\V10A_00.cab
22:26:53 : ------------------Model.dll Information-------------------
22:26:53 : Filename : LGP760.dll
22:26:53 : Version : 0.0.1.0
22:26:53 : File size : 270336
22:26:53 : File date : 2012/06/14-15:49:00
22:26:53 : PC Created date: 2013/03/29-22:26:47
22:26:53 : ----------------------------------------------------------
22:26:53 : *****Check LGCM Programs Start*****
22:26:53 : LGCM Programs Not Found - OK and ready to upgrade
22:26:53 : *****WorkModelDLL Start*****
22:26:54 : strPhoneBinaryPath(C:\ProgramData\LGMOBILEAX\Phone\V10A.wdb)
22:26:54 : strModuleDir(C:\ProgramData\LGMOBILEAX\Phone\)
22:26:54 : strModelDLLPath(C:\ProgramData\LGMOBILEAX\Phone\LGP760.dll)
22:26:54 : _DetachDLL Call
22:26:54 : _DetachDLL Call End
22:26:54 : Call fn_StartUpgrade