[Q] Cannot enter the recovery mode topic

hi guys, it is the first post for me in this forum
since I'm a Hong Konger, i apologize for my bad english
i have flashed the slim rom through cwm recovery to my xperia z2
after flashing the rom, it seems having trhe sound issues
as a result, i was going to wipe it and restore my backup in cwm
however, when entering the recovery, the screen has gone black and the led turns into orange color
i have tried to flash the recovery again through adb in my computer
it didn't work out, after i typed "fastboot flash boot boot.img",
a command of "waiting for device" popped out
but i am quite sure the adb driver is installed
please are there any solution for reflashing the recovery in my phone?
i would appreciate a lot if somebody can help me out