To try cut a very long short I have a Nexus5 that I am now unable to boot. I had used the Skipsoft unified Android toolkit a few months ago to both unlock the bootloader and root the device. I backed up my original OS to my PC. Now last few days I have been unable to access the play store UNLESS on wifi so after trying a new sim card with no success I thought I would use the toolkit to lock the bootloader and unroot the device so I could install the latest 4.4.3 system update(which had already downloaded to the phone), at this point the toolkit chucked up a few errors (DOH..did not write them down, what a thick head). OK so update had downloaded and phone restarts but goes straight into TWRP which now asks for a password WTF ? so then I turn off the phone and back on and all I now have is the google logo spinning and nothing else. It even seems adb does not work is there ANYONE WHO CAN ASSIST ME PLEASE... FEEL LIKE CRYING RIGHT NOW..