This is a tested unlock patch for K800i with R8BF003 CID53
I know it is an older phone but I wanted it as a spare... Hence wanting to unlock it for free!
Apply the security bypass here first:
Patching CID53 (DB2020) and any CID (DB2010,DB2012)
I used this setup as it's ready to run!
jdflasher_anycid_far.zip - 4shared.com - online file sharing and storage - download - Prasanna Samarasinghe
Once the bypass trick is done you are ready to upload the unlock patch.
Remember it will work only with R8BF003 CID53 - Don't try it on anything alse!!