I'm running Android 4.2.2 on my Nexus 4. It is rooted, and I have ClockworkMod recovery installed, but rom and kernel are stock. I received the OTA update to 4.3, and would like to install it, but it failed. (With a message that CWM couldn't verify a signature. I remember that the previous OTA worked, and I think I had to re-root, but that was easy.)
How can I get the stock 4.3 update on my phone, while keeping root and CWM, and especially keeping all my data? Step-by-step instructions would be great.
Also, I'm curious, what is the technical reason that the update doesn't install?
Update: I found some instructions here, however they didn't work for me. I get the following error from CWM while applying update.zip:
Installing: /sdcard/0/update.zip
Finding update package...
Opening update package...
Installing update...
Warning no file_contextsVerifying current system...
assert failed: apply_patch_check("/system/bin/app_process", "76c3a9a7a6d400a9ff3e4db391327daa33aa0663", "2a221441bf06f2618aa6c35ae0cade13bd4f6e1b")
E:Error in /sdcard/0/update.zip
(Status 7)
Installation aborted.
Update 2: I forgot that I tried out Xposed some time ago. Apparently this modified /system/bin/app_process. I removed it by starting Xposed Installer, and then selecting "Uninstall (restore app_process)" and (probably not neccessary), "Clean up (complete removal of the framework)". I did one complete reboot, and then rebooted into recovery mode to continue the update. But now it hangs because "build.prop" is modified (don't remember changing that). I wonder if there is a way to just flash the new OS files (not patches), overwriting any modifications, but keeping all settings and user files...
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