Exclamation [Q] Bootloader Locked

Hi. I have GT-P7500.Rom:P7500XXLQ8 BOOTLOADER:P7500JTLA1 CWM:6.0.3.1 Tab rooted but bootloader locked. When i press power+volume(-) button, tab pass download mode quickly. I can't flash bootloader, recovery or rom with odin . Sbin folder is empty in my tab. How can i solve this problem?