Fake Iphone 6S downgrade

H

HateNames

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Hi thanks for your help in advance.

I'm absolutely new to all this but I tried to get as far as I could without help until now I kind of lost my good will.
So I bought this fake-Iphone in Malaysia and yes I knew it was fake but super cheap as well... wanted to sell it and bla.
Right now I'm in a situation where I decided to keep it for a while as my own phone.
It's a mediatek version and the asian guy I bought it from let it look like it's an Iphone, tried to hide all the features...
Now I used an app to look which version of android would suit this fake phone the best and it's one or two versions down from the current installed one. I tried to downgrade it with an update.zip file of ice cream sandwich 4.0 but Mediatek won't let me flash it from just the phone so downloaded a Smartphoneflashtool on my Laptop but there is no Scatter-loading-file inside the update.zip data to flash.

Can someone tell me where I get the right Firmware to downgrade this stupid phone please
Hope it'll work properly with less laggs after this.

Hardware:
CPU: 1001.0 GHz
RAM: (MB) 478.052
ROM(MB): 640.0
Firmware: 4.2.2
Phone is rooted. I would like to get down to Firmware 4.0.
Smartphone Flash Tool(Runtime Trace Mode) is the Software I downloaded to flash from my laptop as the update.zip data (renamed already it was an Ice cream Sandwich Firmware update... Do I have to name it differently so the Installation doesn't get aborted as soon as I try to flash it from the recovery mode of the phone? I created a backup on one of the Sd-cards inside as there are 2 of them. Need to know anything else? Wanted to use a Rom Manager from Clockwork I installed yesterday to try to flash the update from the turned on phone. This morning I woke up and the app is deinstalled...
Installation aborted if I try to flash my (flashable) .zip data. I don't know which MTK version it is or how to find it out (Altough I read somewhere that Android versions 4.1.-4.3. or something like this are MT657..??)
 
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