mobile

My mistake, my bad mistake, I was trying to gain root and to flash a CM rom, but after first successfull flash of a boot.img with fastboot, I have tried to flash the rom with TWRP but my device was recognized as a wrong model, so I couldn't to flash the rom (in settings it was recognized correctly as D6603), so I decided to flash another boot.img, but it was for Lollipop instead Kitkat and now I can't put my device in flash mode or in fastboot mode to flash the correct boot.img or a fw, turning on the Z3 the display lights on and seems to have a bootloop, I see the splashscreen, but nothing else.
Is there a way to recover it?
Thanks in advance.