LG P500 and CM7. How to make the sim work?

Question

Android

I flashed CyanogemMod 7.2.0 on my LG P500 Optimus One.
Everything is fine, but the sim card is not active. In the settings it says that it is locked and asks for a PIN. When you try to enter the PIN, it says that it is incorrect and it was not possible to unlock it, also if you try to change the PIN.
SIM'ka in order - checked in another phone. This is the same picture on the other.
What kind of rigmarole and is there an option to make friends with CM7 and a phone with a SIM card?
Accordingly, what I found on the topic, not counting a bunch of forums with a missing solution: www.lg-unlocker.com/ - I’m not sure that this is what you need ... IMHO, the phone asks for the PIN, and not some kind of left code, besides I checked at random that he wants a code as long as a pin (from 4 to 8 characters), by the way, while the SIM card is not blocked. It doesn't even get to her.
UPD: It's about the lost IMEI, I restored it with the native firmware from LG. I made backups of everything I could)

Answer 1

IMEI under the battery is indicated on the sticker. Regarding recovery - you can read the branches about Chinese android phones, for them the loss of IMEI during flashing is more of a feature than a bug))