Exclamation [Q] Cant Enter Odin Download Mode after stock 4.4.2 update

Hello guys.

I flashed 4.4.2 kitkat rom on my GT-I9200 using odin 3.09

I9200XXUDNF1 firmware version for Galaxy Mega 6.3 (GT-I9200) from region SER(russia), downloaded from samsung-updates,
(PDA: I9200XXUDNF1 CSC: I9200SERDNF2 MODEM: I9200XXUDNF1 CHANGELIST: 1847610 BUILD DATE: 05.06.2014).


after that os and all phone functions working correctly, Except There is no Phone model name logo displaying when turning on.
i can see a blank screen during that time and it goes off and then comes samsung logo. Thats one problem.

Main problem is,
I just cant enter Odin Download mode anymore!!
Vol down+Home+power and after vol up button combination does not work.
Even cant get the custom binary warning screen. When i pressed 3 buttons, phone just vibrates, (i can see the display is on) then it turns of and doesnt turn on untill i stop pressing all buttons. then again it just turning on normally(with out galaxy mega logo of course).

Although i can get into recovery mode(by pressing Vol down+power and keep pressing only vol up immediately after vibra releasing both power+vol down).
So I downloaded my previous rom file I9200XXUCNC2_I9200OLBCNC1_XSP.zip (4.2.2 Singapore) and copied
both .zip file and extracted .tar file to SD Card and tried flashing from recovery using "apply update from sd card" option.
But it doesnt work.
the .tar file just gives no messages and returns to recovery home after about 2 mins.
the .zip file gives some error messages like "header is worng","footer is wrong" and phone reboot in normal mode.

So i tried using same I9200XXUDNF1 firmware file and I9200UBUDNE2 (Brazil) firmware file, But the result is EXACTLY same for all rom files. (for both .zip or extracted .tar)

I attached pictures of my screen when recovery screen and when trying to flash the rom zip with rom file.

Extremely sorry for my Very bad English. This is my first post in XDA-Forums. I will really appreciate any help regard this problem.
Thanks.
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