Sorry for the late reply. I had to shift my house to new location.
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		| I have an another CDMA working set with Sim card Slot, and if I dial *228 in that set it also say the same thing please inter your 9 digit pin number. | 
	
 I thought dialing *228 will restore settings, once it is activated. 
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		| 1. I have backup my .nvs file from LGNPST, If I again re flash the rom what will I have to do again to come back to reliance CDMA working condition.? | 
	
 Yes. I have flased ROM many times. Once you restore NV you can use Reliance as usual.
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		| Dear one question, I know how to restore NVS from LGNPST software | 
	
 To Restore NVs using LGNPST go to
LGNPST Menu->Data->Data Recovery. From there you chose your backed-up NV file.
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		| Is is compulsory to backup NVS by QPST also | 
	
 No. Only for the safety. That's all.
I feel it is easier to work with QPST than LGNPST for Service Programming. Open QPST Service Programming, backup NV.
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		| please tell me details in how to backup nv through QPST. | 
	
 Yes QPST 2.7 is enough. Start QPST Configuration. From there select port & select Mobile.
From Start Clients menu, select Service Programming.
 
Read details from Phone(Read From Phone button) & Save it to file(Save to File Button). 
 
To restore, select Load from file (Load From File Button)-> write to Phone(Write to phone button).