my english is bad,so i hope that you will understand me..
last week i instaled miui custom rom on my device and after that i couldnt add new contact,so i decided to flash again and i install other miui rom wich isn't for g510 (i think it was for g520- i think that should work but NOT) in instalation i have error mesage..after that i forgot to wipe and install rom wich i first instaled..after reboot my phone was bricked,i couldn't get into recovery and bootloader,just green picture screan with read and blue quads..also i try to install orginal firmwere from huawei site but i get yellow triangle ! and afrer i bricked phone i also tray to instal firmwere but same thing just without text just instalation line wich stop.. will JTAG for flash bootloader help ? or i need to change my mainboard what they told me in store where i bay my device?
Screan looks like picture in attach files