Proscan PLT9609G

Ok, so I have a:
Proscan PLT9609G
Android v 4.4.2
Kernel v 3.0.36+ zhouza@xintu #150 Wed Sep 24 22:23:18 CST 2014
Build # KTU84P.20140924.215542.V001
Bootloader: 2.13
(I'm not sure what "Build Fingerprint" is, but here you go)
PROSCAN/PLT9609G/PLT9609G:4.4.2/KTU84P/20140924.215542.V001 :user/test-keys
(If the above is the same as firmware version, then that's the firmware, if not, I don't know where to find it)

I have looked all over the place, and there seems to be nearly ZERO information on this device.

I've managed to get into recovery, where it says:
"Android system recovery <3e>
KTU84P test-keys".
Beneath that, it lists the usual:
reboot system now
apply update from ADB
apply update from external storage
update rkimage from external storage
apply update from cache
wipe data/factory reset
wipe cache partition
recovery system from backup

I downloaded what I believe to be the full version of Android 4.4.4 ("full-4.4.4-20141025-signed.zip"), threw it on an external SD & tried to install it from there. I selected "apply update from external storage".
It says:
"Finding update package...
Opening update package...
Verifying update package...
E:failed to verify whole-file signature
E:signature verification failed
Installation aborted."

AAAnnnnnddddd..... boom. I'm done. I realize that this isn't the forum for support. I just wanted to give as much information as possible to help you, to help me. If the next step is for me posting in another forum on here, just let me know which. ....or if you have the ability to simply "move" this post, that works, too!

My end goal is to update it to at least 4.4.4. Having it rooted with a custom recovery? WAY better.
I'm just losing my mind trying to figure this out. Any help you can provide, would leave me eternally grateful!!

Thanks to anyone and everyone, in advance.

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