Same problem for me, Stock 4.4.2 with TWRP, the OTA update make my GPad boot only on TWRP, no way to get my system back.
I try this one : http://forum.xda-developers.com/showthread.php?t=2772902
Successful :) My GPad is booting corr...
There's a lot of tutorials on XDA to make flashable .zip, but you can also check this : http://www.addictivetips.com/mobile/app2zip-create-flash-able-zip-files-of-your-favorite-android-apps/
GPS is working fine for me, i'm using it 1h/day with Waze.
Same here for me, deep sleep works fine (according to BetterBatteryStats).
I change CPU governor to interactive, ans installed GreenPower, autonomy is a littlebit better, but battery drain persist...
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For battery calibration, you can use this :
It works good :)