I don't use a toolkit and would be happy to flash the system.Img and boot.img but need instructions on how to do it. You said the stock firmware link is in your signature but it isn't.
I would like to skip 4.4.3 and go directly from 4.4.2 to 4.4.4. I'm talking about a nexus 7 2013 wifi.
So I need the following information to proceed .
1. The Link to download system.img and boot.img for the nexus 7 2013 wifi. Which files exactly?
2. I have fastboot and adb installed on my windows 7 laptop because I used them (once) to root but I don't remember how I used them that one time. How exactly do I use fastboot to flash 4.4.4 ?
3. I presume I will lose root. How do I regain it after the above.
Thank you.
1. The Google firmware link in my signature is the one you want. You say you have the 2013 wifi model, aka flo, aka razor. "Factory Images "razor" for Nexus 7 [2013] (Wi-Fi)" is the proper section for you. You want 4.4.4 (KTU84P), and that's at the bottom of the razor section. Click the link to download.
2. Download the most up to date ADB/Fastboot from the link in my signature (19.0.2 (API 19)). Don't extract it yet.
3. You will lose root. Download SuperSU from my signature. 2.00 is the current version. After you download that, you can put it on your device so you can flash it in recovery in a few minutes.
The firmware you downloaded is razor-ktu84p-factory-b1b2c0da.tgz. This is a compressed archive, and you will need to extract it. If you don't know how,
7-Zip should work.
So, you've extracted the files. Delete flash-all.bat, flash-all.sh, flash-base.sh (so you don't accidentally run them).
Now, all you have left is bootloader-flo-flo-04.02.img and image-razor-ktu84p.zip.
Extract image-razor-ktu84p.zip to the current directory, so you will now have bootloader-flo-flo-04.02.img, boot.img, cache.img, recovery.img, system.img, userdata.img, android-info.txt, image-razor-ktu84p.zip in your folder.
Delete userdata.img, flashing this on accident will wipe your data. Delete image-razor-ktu84p.zip, android-info.txt, cache.img, recovery.img (this is stock recovery, you want TWRP).
Now you have boot.img, bootloader-flo-flo-04.02.img, system.img.
Remember the ADB & Fastboot zip you downloaded from my signature? Extract it to the directory with bootloader-flo-flo-04.02.img, boot.img, system.img. All 4 files. This directory now contains 7 files.
Back out of the razor-ktu84p folder. Just one step back. Now, hold shift the right-click the razor-ktu84p folder. Select Open command window here.
Reboot your device to bootloader mode. Do so by shutting it down. Then while the power is off, hold volume down and press the power button. Release these buttons when you see the big green Android.
In your command window, type the command: fastboot devices
Your device with it's serial number should show up on the list. If it does not there is a problem and you need to stop here.
If the device shows up, let's update it.
fastboot flash bootloader bootloader-flo-flo-04.02.img
<wait for it to finish>
fastboot reboot-bootloader
<wait for it to reboot>
fastboot flash system system.img
<wait for it to finish>
fastboot flash boot boot.img
<wait for it to finish>
fasboot reboot-bootloader
Done with fastboot.
At this point, enter recovery (TWRP) and wipe cache and Dalvik under advanced wipe.
Remember the SuperSU you downloaded earlier and put on your device for later? Flash that now.
Reboot, all done. Most of this is just juggling files around. If you have any questions ask.