Failed 4.4 install

[Android Question]

Hello guys. Something REALLY terrible has happened and I have no idea what to do. I finally got notified that my Nexus 7 (2013) has downloaded the long-awaited 4.4 update and that I can install it. I clicked OK, and it rebooted into recovery. I have TWRP installed. I don't remember what it said, I think something about missing MD5 or something like that. Then TWRP main menu opened and nothing was happening. I used the TWRP reboot function, and when my tablet started back up, it was still on 4.3. When I check for updates it says the tablet is up to date.
It is rooted and with a custom kernel, but stock ROM and original build number.

Did I lose my update opportunity and will have to wait for the next notification? I thought it was downloaded already.
If I can get it again, what do I do to make it install correctly? I got the exact same error back when I started to install this OTA manually.

 

[kevindroid]

you can return your device to stock and then try updating your n7. custom recovery will not work with ota you could also go over to xda dev and download a 4.4 rom and install with twrp

 

[scary alien]

You need to basically have a completely stock system when trying to accept / install an OTA.

There are checks within the OTA .zip file's updater-script that will compare the SHA1 (not MD5) checksums of the files on your device with what it expects (i.e., stock components such as a stock recovery partition and stock kernel). It doesn't check every file, but it checks hundreds of them.

You'll need to either flash a stock ROM as kevindroid indicate and a stock recovery or re-flash a factory image.

After you do that, you should be able to accept / install the 4.4 OTA.

Best of luck!