Hi there. I am trying to flash a stock rom to my gs5 900a with heimdall on my mac. the device is detected but i cant seem to download the pitfile it says claimed interface error. I think its because i system wiped my phone with safestrap when i was trying to intall a custim rom. anyhow I am softbrick state now. i cant get passed samsung galaxy window with the lock. myphone was also unlocked to use metropcs and it was also rooted. any information out there could that would help would be appreacited. thank you very much.