[Nexus 7 Q&A, Help & Troubleshooting] GedBlake:
Hi, Boncey...

When you say 'convert', I assume you mean 'encapsulate' it into a CWM/TWRP flashable .zip.

Well, that skill and level of technical knowledge is a bit beyond me, I'm afraid. But changing a boot animation is a relatively trivial task, providing you exercise care, and are comfortable poking around inside /system.

I've tested your bootanimation.zip on my own Nexus 7... and it works... but there's too long a duration after the animation has run, before you're presented with the home launcher (or Android desktop). All you see, after the animation (which runs for about 2 seconds) is 30 seconds of black screen:(.

It's also quite large, clocking in at a whopping 9.7Mb... compared to the standard KitKat 'dancing colored circles' boot animation... which is just a miniscule 714Kb.

Anyway... here's the how-to-bit...

Your Nexus 7 will need to be rooted.

You'll also need a root capable Android file manager. There are several such file managers available on Google PlayStore, with

ES File Explorer File Manager

arguably one of the most famous and renowned. But I prefer

X-Plore file manager

, because it has dual-pane capability, which makes copying stuff from one location to another easy. So my instructions and thumbnails that follow are written with 'X-Plore file manager' in mind...though they should be adaptable to any root capable Android file manager.

Whichever file manager you choose... you'll first need to go into its settings or configuration options, and enable root... you'll also need to enable a setting which allows changes to be made to /system.

In X-plore filemanager, this is called Superuser+Mount Writable (Superuser mode, which allows changes in read-only mode).

(See thumbnail no.1, at the bottom of this post).

Other Android file managers may use a different description and words... but the key thing to remember, is that you're allowing the file manager to makes changes to /system. And for this reason, EXTREME CAUTION should be exercised when using the file manager with this setting enabled. By default, and for very good reasons, /system is set as READ-ONLY. Enabling the 'Mount Writable' option, makes /system READ-WRITE.

Once you've completed the following procedure, remember to disable the 'Mount Writable' option.

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OK... with that lengthy preamble out of the way... we begin.

The Nexus 7's boot animation is stored in a folder called /system/media... and unsurprisingly, its called bootanimation.zip:).

The first thing you need to do, is rename this file. When doing this sort of thing on my own Nexus 7, I just rename the file extension... so, bootanimation.zip becomes bootanimation.bak

Leaving the old (original) boot animation in place is a good idea, so should you tire of its replacement... you can easily revert back, by simply renaming the files extension back to .zip, ie., bootanimation.zip

Next... copy the new replacement into the same system folder... namely /system/media

You should now have two files in the folder /system/media...

/system/media/bootanimation.bak - the original boot animation, but disabled.

/system/media/bootanimation.zip - the new, replacement boot animation.

(See thumbnail no.2)

We're nearly there... but there is one last thing to do... set the file permissions on the new bootanimation.zip file.

How this is done will vary from one file manager to the next... but in X-Plore, it's accomplished by LONG PRESSING on the file in question, until a context sensitive menu appears.

(See thumbnail no.3)

Select the option marked 'Permissions'... a dialogue box will appear with nine check boxes.

Ensure all the ones for READ are ticked, and just the USER one for WRITE. The permissions mode should amount to 644. Anyway, it's probably better if you just take a look at my screenshot at the bottom of this post. (Describing this sort of thing makes my head hurt... a picture really does paint a thousand words:)).

(See thumbnail no.4)

Finally... go back into the file managers settings option, and disable the Mount Writable option (or whatever it's called in your chosen file manager).

Right that's it... you can now reboot your Nexus 7 and enjoy the dubious pleasure of watching the green Android mascot peeing all over an Apple logo... I'm guessing you're not a big fan of Apple!:).

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Although the above sounds fairly involved and complicated... it really isn't. Like all things technical, it's easier to do, than describe. Descriptions often run to several paragraphs for the most prosaic of things.

Summary.

** A rooted Nexus 7.

** A root capable Android file manager.

** Enable root and Mount Writable or similar option in your chosen filemanager.

** Rename /system/media/bootanimation.zip...to.../system/media/bootanimation.bak

** Copy the new bootanimation.zip into the folder /system/media.

** Set file permissions on it... to 644.

** Disable Mount Writable or similar option in your chosen filemanager.

** Reboot... Enjoy!:).

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Good luck... and hope this helps.

Rgrds,

Ged.