LG P768 slow boot

I have my lg p768 with unlocked boot loader, I had custom rom moke 4.4 but I installed the original firmware V20A_03.kdz (Telcel Mexico) to try to fix the problem but didnt work, the phone takes like 15 or 20 minutes to boot, I have back up from other custom roms but when I restore any of them I have the same problem, I did a hard reset(power button+Volume down+home) , I did it from the recovery and nothing, I don't know what else to do, help me please :(

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