Unlocking P900 - Esato archive

Posted by realspido
Hi,
I just bought a used Sony Ericsson P900, and unlocked it. But something was wrong with it - some of functions didn't work properly so I decided to upgrade the software on SonyEricsson's website. Everything was fine, but after I turned the phone on it didn't recognise my sim card. Looks like I've got the phone locked again. The point is I'm not sure if those errors appeared before or after I unlocked it. Now, shall I try to unlock it again and spend another Ł10 without being sure eveything will be fine, or what?
Please help me.
Thanks