Updating LG Fathom firmware will lock it again?

[alamodein]

Hi,

Sorry if its a kind of repost.
I tried searching but didn't find any topic related to my questions.

I have a unlocked LG Fathom which I am using with TATA GSM Docomo network in India. Its firmware is V4. My Questions:

1. If I update it the firmware to V7, will it lock the phone again and I will not be able to use any GSM Sim?

2. Now in V4, GSM works fine, but when I select CDMA mode and put Reliance CDMA sim, it goes kind of hang and does not respond, no network. Why its so?

3. Without any sim it shows reliance CDMA network in roaming mode, but could not program using *228 and Handset Transfer Card. Any Solution?

4. If by chance I am able to program it on Reliance CDMA (without SIM) using *228 and Handset Transfer Card, will I be able to use GSM sim also in it?

Thanks in advance!!!