you can go for the following alternative numbers any one of these DDE numbers are same according to your DDE 8 512 587
8506199,7812000,7811700,7810000,8508711,8506199,7809000,7806699,7808401,7807530
WHEN YOU MOUNT any dde of these numbers after programming flash and update your dde will become same number 8512587
i hope the information will help
regards