It is probably easier with OTA. The procedure that should work (non tested):

Download mp-fremantle-generic-pr package (e.g. with command apt-get install -d mp-fremantle-generic-pr ).

Unpak it (with ar command), and unpack the file control.tar.gz.

This file includes a text file called control, which includes a list of dependencies. Edit this file, removing cherry.

Repack control.tar.gz and replace it in the deb file (again, with ar command).

Create your own repository, and put this modified package in it.

Add your repository to apt sources.list, and run apt-cache policy mp-fremantle-generic-pr to make sure it will be installed from your repository, and not from Nokia's.

Then, apt-get dist-upgrade should update your system OTA, without cherry package.

If you want to create an installable fiasco image, download the firmware image, and use the flasher-3.5 tool to unpack the fiasco image. The largest file is the root ubifs image. See instructions here for mounting it: http://osl.sed.hu/wiki/ubifs/index.p...oad_the_source . After mounting it, you can change it, unmount, and repack the fiasco image.