As you may already be aware, it is locked because too many wrong codes have been entered so make sure that you have the CORRECT CODE ( Confirm the code by asking another question quoting the SERIAL NUMBER which should start M******).
One method that might cure the LOCK10 is as follows; Press ( and hold ) preset 6 for a few seconds until CODE is displayed. You will get a further 3 attempts at code entry. In the case of the 2006 models, pressing both SELECT and MANUAL keys simultaneously will permit one further attempt.
Please report back here whether this was successful or not..Thanks
RegWorts
June 2008