[Q] Error while flashing a CM based ROM after downgrading to KK from 5.0 topic

So, I had Asia 5.0.2 and I saw a FIUI ROM for our device at the MIUI forums. I decided to give this a go and first downgraded to KK and then tried to flash the zip from TWRP and Philz recovery but got this error:

"Can't install this package on top of incompatible data. Please try another package or run a factory reset"

I thought it might be a ROM specific error, but I also tried to flash CM11 but got the same error. How can I get around this? Is this an issue with the updater script or something?

Any help will be appreciated.

Help downgrading to install CM12 topic

Hi!
I'm quite new to this model, but very familiarized with IT and nexus devices, as well as some samsung ones.
I got the phone one week ago and after updating to the latest 5.0 stock firmware, I think in some days I'll be good to go to AOSP and never look back :)
Now, I have been doing my homework and reading around how to do it, but I finally must ask some questions that I still cannot figure out.
Model: European D855 16Gb
Current ROM: V20f-EUR-XX
Baseband: MPSS.DI.2.0.1.c1.13-00048-M8974AAAANPZM-1

First of all: I read somewhere around xda that I'd better use .tot files instead of KDZ because some people report bricks with the KDZ files (Hardbrick or softbrick, anyway?)
Second: I am following this manual: http://www.androidrootz.com/2014/07/...-variants.html But it's from july 2014, so perhaps there are some caveats with the latest 5.0 version?

Those are my two questions, and I think they are pretty critical, since I'm risking a hard brick if I don't do them right.
About how to stump and bump once back in KitKat, I have no problem, it's pretty straightforward, so I don't need advice on that.

Any help will be welcome.

Thanks!

Problems with downgrading to KitKat topic

Hey guys, I'm trying to downgrade to KitKat after all the issues Lollipop is giving me and the incompatible apps I'm trying to run.

I am following instructions here but I came across a problem when flashing the system.img file.

The error it gives me is:

FAILED (remote: Insufficient memory.)

I can't flash over system and can not boot.

What am I missing? I was rooted and my bootloader unlocked prior to starting and I tried with the factory recovery and the 1.2.1 recovery image.