Here is a link to my DropBox for a folder that I have named "Pull System" on my computer. I used it to pull copies of all the apk's and other files/folders from the /system on my Droid 2 and Droid Charge to the folder on my computer. That way I have everything from the /system folder on the phones at my beck and call.
http://dl.dropbox.com/u/35546129/Pull system.zip
Just download it an unzip it on your desktop.
Read the ReadMe.txt to get your phone recognized by your computer via USB.
From inside the folder I typed:
adb devices
adb pull /system/* /system/.
All the files and folders in /system on the good phone are placed in the folder System inside the folder System in the Pull System folder.
I can mass install the files back to /system on either phone with the command:
adb devices
adb push system/* /system/.
or push individual files/folders to the phone:
adb devices
adb push system/whatever.apk /system/.
If the phone is not recognized by the computer there are in the Readme.txt file that will guide you into a remedy.
I do not know where I got the folder from or who authored it, so I can not credit the author. I do not remember the original name of the folder. I renamed it on my computer for my own clarification as to what it does.
Hope it helps in that you can use it to pull the /system folder off your friends phone and then copy it directly to your phone if you can get the computer and adb to recognize the phone.