Hello guys, I did mmi 2g update to 5150 (im from Europe) and got error, no sound after. Went to Audi dealer , they said i need to replace Bose amp. 1.2k eur ... they said i need part nr. 4EO 910 223 P. I started looking for second hand and there is lot of 4EO 910 223 F, but zero with letter P at the end. Did anyone had this problem? what means that last letter? should i try to buy with letter F ? p.s. english is not my main language so sorry for mistakes.