Panasonic KX-TD500 System Reference Manual page 1539

2.00 VUP command (Version-up)
Description
Used to initialize the RAM area of the newly
added system memory while keeping the current
settings intact.
Command Format
OPE>VUP + old ROM Version No. (Vxxx)
Display Example
;OPE>VUP V1.18 <CR>
; V1.18 - V2.00 version up
>
; Are You Sure? (Y; Yes, Other: No) =
;
;OK
;OPE>
Conditions
After replacing an old version of ROM with a new
version of ROM.
"Additional System Memory Initialization" should
be done before programming the newly added
features. Then newly added system memory is
initialized by default values.
Note:
If you do not execute this operation after replac-
ing the ROM, the system malfunction may occur.
16-G-3