SGH-I777 Soft Bricked

Hi Guys,

My Samsung Galaxy S2 SGH-I777 is soft bricked. It only goes into download mode when the usb cable is plugged and the (vol up down + power) buttons are pressed. When the cable is unplugged, it doesn't turn on. I've tried the following steps by creepyncrawly at last but couldn't get it to a working state.

1)Go to this post and download the Tar version of Siyah 2.6.14 Kernel. Flash it in the PDA slot without ticking Re-Partitioning. If you get a pass, it won't boot, so turn the phone off and then back to download mode and...
2) Flash the full stock Gingerbread distribution from the Download Repository, I777UCKH7 including the bootloaders and everything, in the PDA slot.
3) If you get a pass here, then the phone might boot, or you might have to boot into recovery first and perform a wipe data/factory reset. If you're able to boot the phone, then you are back in business, and can flash whatever firmware you want.
If it is not, then:
4) Download the SBL Bootloader from the Download Repository. Flash it as PDA in ODIN, without ticking Re-Partitioning.
5) Flash the Kernel, as in step 1.
6) Flash the full stock Gingerbread distribution, as in step 2.

Even before that I tried many other things from various forum posts.

Please help me to get this working again..

Thanks so much