Nexus 7 grouper, manual update fails

I have a Nexus 7 (2012, grouper) which so far I have kept on 4.1.2 (JZO54K) using FOTAkill, but now I want to update to 4.2.2. I also have the latest CWM recovery (6.0.4.3).

I plan on applying successively:
094f6629314a.signed-nakasi-JOP40C-from-JZO54K.094f6629.zip
then
659e6288b87d.signed-nakasi-JOP40D-from-JOP40C.659e6288.zip
then
6ece895ecb23.signed-nakasi-JDQ39-from-JOP40D.6ece895e.zip

Using ADB I tried to apply the first update, but it fails. I also tried applying it from /sdcard, but the same thing happens. The error message happens after "verifying current system..." and it consists of:
assert failed: apply_patch_check("/system/app/Browser/ProviderProxy.odex", "21a896ab...
E: Error in /data/media/094f6629314a.signed-nakasi-JOP40C-from-JZO54K.094f6629.zip
(status 7)

I tried downloading the zip update again, but it still fails. I downloaded it from http://android.clients.google.com/pa...K.094f6629.zip

Best method to unlock grouper 4.3

Just got my N7 wifi back from Asus after their lollipop update bricked it.

It came back installed with 4.3 (nakasi update version JWR66Y).

What is the recommended method to unlock it so I can flash twrp via fastboot and install CM12.1?

Are there kernels for N7 Grouper with Tap2Wake and 5.1.x support?

Hello all,...
I am running an unlocked N7 2012 Grouper with TWRP2.8.7.0, Lollipop 5.1.1 Rom from Chroma and right now the M-Kernel 5.1.
I really would like to have the Tap to Wake or Double Tap to Wake feature but can't find a Kernel which supports that.
Earlier versions of the M-Kernel should, but the actual version isn't, so I am wondering if there are other kernels which support that feature.
I love it on my HTC and also on my Z3 compact, and it would be so great if that feature could also make it to my N7 ;)

Any help or hint is really welcome..

Many thanks in advance...

Thalys