for those who are interested, the following products codes are available on the nokia site for upgrade to v21 firmware..
0575408: 5800 HK CV B V2
0581337: 5800 HK CV BK V2
0575407: 5800 HK CV R V2
0576387: 5800 RM-356 FI CV B 25 TRACKS V1_COLOR
0580456: 5800 RM-356 FI CV BK 25 TRACKS V1_COLOR
0576385: 5800 RM-356 FI CV R 25 TRACKS V1
0582194: 5800 RM-356 Wind IT R V2