Any chance for the newest update zip? 5.01
If you are not yet on 5.0 the following might work....
Note: I'm just summarizing information which I found at various places here @ XDA-developers and elsewhere. What is described below works for me, no warranty that it will work for you as well. I'm not responsible for anything that happens when you try following the description below. It's @ your own risk.
You have been warned!
You'll need: Tassadars build
lrx21p_flo.zip and the factory image
razor-lrx22c-factory-a9c6e55f.tgz, a computer running Linux (I'm on Ubuntu 14.10) with some Gigabyte free space and, finally, the tool "simg2img". In Ubuntu the latter can be installed using
sduo apt-get install android-tools-fsutils
At first unpack "system.img" and "boot.img" from the factory-build into a new directory. I started in the directory where I put the two builds and used "lrx22c":
Code:
mkdir lrx22c
cd lrx22c
tar -xzf ../razor-lrx22c-factory-a9c6e55f.tgz razor-lrx22c/image-razor-lrx22c.zip
unzip razor-lrx22c/image-razor-lrx22c.zip system.img boot.img
Then convert and mount the system image (using options for mount, you'd need to be root, i.e. use sudo) and create "system .tar.gz" in a subirectory called "rom"
Code:
simg2img system.img system.img.raw
mkdir mnt-img
mkdir rom
sudo mount -t ext4 -o loop system.img.raw mnt-img/
sudo tar -czvf rom/system.tar.gz -C mnt-img/ .
The final step is to exchange "system.img" and "boot.img" in "lrx21p_flo.zip" and create "lrx22c-test_flo.zip".
Code:
cp ../lrx21p_flo.zip lrx22c-test_flo.zip
zip -u lrx22c-test_flo.zip rom/system.tar.gz
zip lrx22c-test_flo.zip boot.img
This will leave you with a zip file ("lrx22c-test_flo.zip") that can be flashed as secondary ROM in MultiROM. I trust you know how how to unmount the raw-image and to "get rid" of all the files and directories that were created.
Good luck!