Phone doesn't start & continuously restart without the logo appears

My phone at the beginning start on a restart loop so i tried to install the android through the SD card, But the phone didn't read the UPDATE.APP file & using the USB the phone couldn't be formatted.

finally i tried the firmware update without the PRELOADER file & finished but when i opened the phone it showed the Logo then turned off THEN i can't turn it on as it always vibrate as on then vibrate as off continuously without the screen showing anything & to stop it i have to remove the battery & when connected with USB it also do the same & the LED is RED.

Your help is highly appreciated.

Thanks in advance...