how do you unblock my 206 blaubunkt radio?

my battery has been disconnected and i havent got the code for the radio nor has the garage i bought it off.. i have entered test codes to no avail an now it is coming on as 'blocked' ... please can some one help me..
it is a peugeot 206 the radio is a blaubunkt an the code on the radio is bp8146x4794952 and also 7 648 146 392

thanks