Firmware 	Release date 	Application
DD7031-00-620 	07/31/2001 	7000 (Nonflash) Payphones
DD7431-97-430 	07/31/2001 	7000C Flash Payphones
DD7030-00-970 	02/02/2001 	7000 (Nonflash) Payphones
DD7230-00-150 	10/09/2000 	Model 310 Chassis
DD8830-00-330 	10/09/2000 	8000 Chassis
DD7024-00-560 	06/13/2000 	7000 (Nonflash) Payphones
DD8822-00-000 	04/2000 	4000 Series phone
DD4322-00-000 	04/2000 	2000 Series phone
DD7024-00-500 	01/11/2000 	7000 (Nonflash) Payphones
DD7024-00-000 	11/1999 	7000 (Nonflash) Payphones
DA9003-X016 	09/1999 	
DDXX21-XX-XXX 	11/1999 	*1 *2
DDXX19-XX-231 	12/01/1997 	*2
DDXX18-XX-800 	06/30/1997 	
DD4318-33-69A 	06/25/1996 	2000 Series phone
DD7018-00-69A 	06/25/1996 	7000 Series phone
DD8818-00-699 	06/25/1996 	4000 Series phone
DD4318-33-37 	08/31/1995 	2000 Series phone
DD8818-33-37 	08/31/1995 	4000 Series phone 

*1) Updated version of Firmware DD Release DD-XX21XX-XXX. The new #2 bulletin contains a revised chart outlining the operation of the Call Restrict, CDR and Capture Digits features. Mars Electronics® MS-16 coin mechanism is not compatible with DD7021 firmware.
*2) ECS II may become disabled after downloading DD-XXXX-XX-231 firmware.