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Without details it's hard to comment meaningfully, but the most common generic problems involve the USB port and/or cable. Don't use a USB 3 (or USB 1) port, use only USB 2 ports. Make sure you use the original cable or a good quality substitute.
What .zip do you have? I hadn't seen anything about an OTA being pushed out yet, just the factory images (which have to be flashed through fastboot, not ADB).
I pulled the images needed and compressed them into a zip file so I could sideload them. It wouldn't work. So then I tried flashing the images individually through fastboot and I kept getting an error that said the image could not be read
> adb reboot bootloader
> flash-all.bat
Also, if you are running the flashboot-all script, I would go into the image zip and remove the userdata.img file. If it flashes that, it will override your data.

Unless you remove the -w (wipe) option from the flash-all script like I mentioned
That's the route I took and I didn't lose anything.
Ah, I didn't know that. I did both just to be sure.
So i could just download the image factory zip and flash it with CWM?
I got another question, im using the kit kat rom from the nexus 5 like for a week already, i heard that when i flash the nexus 4 version of kit kat, i will lose the google experience launcher that the nexus 5 brings, i got use to that new launcher already, so the question is can i flash that launcher to the phone after i flash the [4.4 KitKat][KRT16O] rom?
No need to flash for the launcher. Just install the apk.
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