Upgrading Rom of already upgraded Uni... Unlock again?

[interestingfellow]

So, I got my hand on an Uni G4 (xda exec) that has 6.5 on it... I want to downgrade to the Tmo UK WM5 rom.

How do I know if I have to unlock the sim and cid (again)?

Under what circumstances would the sim and/or cid be re-locked (after it had been unlocked)?

And how do I know if I should do a DOC format? I see that there are a few ROMs that once installed require a DOC format if you want to change the ROM again.

And I did search the forums first, and could find the answers I need. I'm still checking up on the ROM that is currently installed on my Uni - 5.2.23016 (5.3.0 Luca16)

TIA!

[orb3000]

Once it has flashed the 1st cooked ROM it has to be full unlocked, no need to do it again so you can downgrade without any problem os locking sim.
Have a look here to get one great wm5 ROM
http://forum.xda-developers.com/showthread.php?t=549207

Hope it helped,

[interestingfellow]

Awsome!
Thanks!