Galaxy Mini bricked: black screen

I have a Galaxy Mini GT-5570 phone. Last night I installed "ROM Manager" and tried to partition my SD card. It requires rebooting my phone, and I confirmed that, so it shut down my phone. Then it can't boot anymore -- all I get is just a black screen! Unfortunately, I read that ROM Manager can cause a hard brick for Galaxy Mini lately... I tried all possible solutions found on the Internet, but nothing works. So I decided to try the USB JIG method as it can force my phone to boot to download mode. The point is that I can't find a 300k resistor, then can I try 330k or is it dangerous? Is there another method to revive my phone back ??