Let's start by know what's an APK
Android application package (APK) is the package file format used to distribute and install application software and middleware onto Google'...
I bring to you Xperia Z2 Calendar App ported for Android 4.1+(i.e. Android 4.1 and above-->Preferably CM)
Disclaimer : I'm not responsible for any bricks. Try at own risk.
Thanks to DooMLoRD for his system Dump over Here
and to Ji...
Rooting, unlocking bootloader and help threads
Root, Backup TA, Unlock bootloader and more! The ultimate Xperia Z1 guide
Xperia™ Z1 Themes & Apps Index
Xperia Z1 Bootloader Unlocking/Relock...
Let's get started :D
Apktool.yml :It contains some of the basic information regarding the apk it version the its file name(It's not the name that you see but you can say it be a like a code name of the apk that actually plays role in linking ...