Star S7189 MTK6589 Bricked topic

Hi.

I just have a Start S7189 MTK6589 based with firmware problems, that don't power ON.

For recognize the bootloader I need to use the KCOLD between GND, if not phone is not recognize. WinXP recognize it as Bootloader.

I use the ROM from the manufacturer send to me, also I test roms from needrom.com.
I test some flashtools, sp flash tools 3 (diferent versiones), flash tools 5 (the newest) and the SP Multiport flash tool.

When I try to flash, the pc upload the bootloader to the phone (first red bar), and stops. In 1-2 min appear different error based on the software version i use. The PC newer start to flash the phone, simply stops in the first red bar "Download DA".

I make this without battery, and I have 2 WinXP pcs (one of them is currently flashing another models). I use the cable directly to the PC and also use a USB 2A Powered HUB (the normally I use) for load data and power them. Same.

I think the bootloader or similar is damaged and can't start to download data. Also I try to press volume and home keys (and maintain pressed) before phone was connected to PC, and nothink change.

Any suggestion?

Thanks.