HI I bought a JVC KW AVX 820bt from the states area1 and i live in greece eu. i just found in a site a method by programming a remote with cd jvc function and missing buttons like urc 7780-81 or some philips rc and get near the solution but i stuck in where is asked from the avx 820 the 4 digit model code.can anyone help or show me how to find it? i try allpossible num combinations from serials and model on my jvc but is alot to try 9999 combinations. any suggestions?}