Thank you JOE! Thats really cool. I think it went quick (even if I was told the roms would be available this week, I didn't believe it - yeah - I need to appologize that I didn't trust you). Most vendors don't provide images at all, so I am really happy that you do. Thanks!
For the others: Maybe you ask whats difference between AOSP and Fairphone OS. At least I did. Ok, so I checked which files exist in one package and not in the other:
$ diff -rq FP_AOSP FP_OS | grep -v "sind verschieden."
Nur in FP_OS/system/app: FairPhoneHome.apk.
Nur in FP_OS/system/app: FairPhoneHome.odex.
Nur in FP_OS/system/app: FairPhoneIFixIt.apk.
Nur in FP_OS/system/app: FairPhonePeaceOfMindApp.apk.
Nur in FP_OS/system/app: FairPhonePeaceOfMindApp.odex.
Nur in FP_OS/system/app: FairphoneUpdater.apk.
Nur in FP_OS/system/app: FairphoneUpdater.odex.
Nur in FP_AOSP/system/app: Launcher2.apk.
Nur in FP_AOSP/system/app: Launcher2.odex.
Nur in FP_AOSP/system/app: QuickSearchBox.apk.
Nur in FP_AOSP/system/app: QuickSearchBox.odex.
Mainly, AOSP contains the stock android home app (launcher), FP OS contains the fairphone home app (launcher).
So FP OS, is what was installed on the phone on delivery.
If you flash one of these images, the google apps will be removed from the phone. Probably, there is NO factory reset (=deleting user data) necessary, to remove the google apps. Flashing the image is enough.
Hope that helps.
Another tipp: If you have already bricked your phone, you will not be able to copy the files to the internal SD-card and the recovery application is not able to read from the external SD-card.
But in this case, you can still install the firmware with adb sideload
(You will need to install adb, either by installing the http://developer.android.com/sdk/index.html#download
or by installing adb from your linux package manager (ubuntu). A recent version of adb is needed, as adb sideload is a newer feature).