Put the files in the forlder /clockworkmod/backup/choose.a.name/ no spaces!
Ah! Read the red PS first...
In Droid 2 Bootstrapper:
1- Press "Bootstrap Recovery" button and wait for "Success!" popup message.
2- Press "Reboot Recovery" button, it'll restart your phone in ClockworkMod Recovery.
In ClockworkMod Recovery:
***Use Volume or direcional keyboard buttons to navigate, OK button near direcional buttons for "enter" (some say camera button is like OK, but not for me) and Power button is ESC/Back, if you press Power on Main Menu the phone goes black, just press it again.
The phone boots to ClockworkMod Recovery if you shut it down and put it to recharge, but inside the menu recharging doesnt work, so have the battery 100% charged.
2- Navigate to "Backup and Restore", press OK.
3- There are 3 options: Backup (you may want to do this before) Restore and the third one (I think its "custom restore"), select it and then the system.img, and it will ask you to confirm. Finish!
PS: Maybe you'll need to "Wipe data/cache partition" and loose all your configs. if you don't do this, MAYBE you will get a bootloop, if it happens just boot to recovery (can be the normal one, just turn on the phone press some key I don't remenber) and wipe data. I did this when installed Apex Rom 1.3.1 for Droid 2, yeah no phone calls though...
PS2: System is in Portuguese (TIM-BR), can change in configs to English and Spanish.
PS3: A good console.