1. select com/ufs/usb as interface
2. go to semc tab
3. select correct model
4. on settings tab, check "signed mode","do full unlock instead usercode reset"
5. back on semc tab
6. press unlock button
go to empty fill select k800 and chek for signed in sittings tab return to empty fill press recover after put correct gdfs file then correct erom file press flash and that is it and after all go to sony-ericsson select k800 in settings chek signed and customize and unlock voila your phone is unlocked for goooooooood and free of charge thanks
Your mobile is locked with network provider.So that it displays the incorrect sim. I found an unlocking service at Superunlockcodes.com .It provides the unlocking service for your Sony Ericsson k800i .You can use this and unlock your mobile easily.
