Here are the steps for Making Classic 2258 RUIM enable.
List of require things
1) win 2k or XP PC with USB port
2) Data cable of FWP 2258 with drivers (both comes free with FWP)
3) CDMA workshop 2.7
Step -1
Do all physical connections and install data cable drivers,
It will create a virtual Com port on your system.
(Say after installing driver it took com port 8)
Step -2
close all application and start CDMA workshop.
From Main screen select com port 8 (or select your port which connected to your FWP)
Then click CONNECT.
Then click on READ.
Step-3
Select SECURITY tab,
In SPC, Select Universal EFS Method.
Then click on READ.
One box will pop up, Select NVM_0002.
Then click on OK.
You will see one screen with lots off dots, in between dots you will see continues 6 digits.
(It will be like ............320530......)
Write down these 6 digits, This is your SPC code.
Click on OK and close the SPC screen.
In SPC box type the 6 digit SPC code. and click SPC button.
Step-4
Select "OTHER" Tab
In R-UIM section
Select Config = R-UIM only and click on WRITE.
One box will appear it will say programing successful . . then click on OK.
Step - 5
After completing step -4 , close CDMA workshop, Switch off your FWP,
insert R-UIM and power ON your FWP.
And you are done.