mobile

Hello everyone...this is my first thread on xda. I'm trying to flash a new kdz for my phone since I think I broke the wifi and cellular radio firmware through all of my haphazard flashing. The only problem is I cannot get my phone to enter fastboot using the adb command or the key combo (volume-up + usb cable in). I want to try and flash back my laf.img ....but without fastboot I'm honestly pretty lost. Any thoughts?