Android 5.0.1 bootlop topic

Hey guys!
Yesterday tried flash 5.0.1 via nexus root toolkit in flash everything ok but after update causes bootloop...I tried 5.0 and 4.4.4 via flash stock but again with a bootloop how to solve this problem?

[q] [help] bootlop, usb not working topic

HELLO. I was running android 5.0 on my moto g, but then i downgraded to 4.4, miui v5. But I couldn't root it and couldn't also go to cwm. So I decided to flash the stock firmware using fastboot. But when it was done, the phone got a bootlop and now, when i connect it to the pc, the device isn't recognised. = pc knows, that it is connected, but cannot recognise it. And the device doesn't recognise anything. Any solutions?