Xperia X10 Unable to read SIM card

[besus]

I have xperia x10 mini and I love it..

when I bought it the sim was worked and every thing is normal but I update software and sim didnt work..

I try to back to 2.1 and still unworked..

where is the problem?

hope someone help me.......thanks

[Thommo]

Try performing a system repair as this will often fix issues - This will factory reset your phone

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP