SIM card problem after rooting

hi, i have a big problem. i rooted my phone and put a custom cyanogen mod with locked bootloader. it was all good till i found out that my sd card won't mount but it works on other phone. nice s****y cyanogen mod. then all problems came up. i couldn't do nothing with that sd card, couldn't do backup so i went to flash it to stock, somehow i factory reseted it and i thought i have a stock rom and that's all good and that i won't have problems at all.
but suddenly, i didn't have gsm signal so i rebooted the phone. after reboot, it says that there's no sim card. so i downloaded http://forum.xda-developers.com/xper...2-1-1-t2859279
and tried that, but nothing better, problem is the same with sim card. that lights at the start of booting tell me that cyanogenmod or root is still here.. the normal light on booting is only 1 light in the middle of light bar (red i think) and i still have blue red and green that flicker when the phone is booting. so please, if there's anybody who's willing to explain it to me, step by step, what to do, what to download.

i tried with flashtool, i don't get it, so please don't give me the link for that which already exists 'cause i don't understand s***, because of bad explanation for noobs.

just want to get it back to stock/normal again and get the hell out of this forum and stuff. :mad: thanks