Ok guys, a little update
I did a small research about this kind of BM54 Back wit round pins and I found interesting things
http://www.xoutpost.com/electronics/...nt-bm24-2.html This tread is also very interesting and especially last post
BM54 with BM24 pinout ????
What I found is a really interesting and looks like no one knows it
I`ve opened my BM54 Back OG (old generation) and compare hardware with a real BM54 NG (new generation). The only difference between them is a PCB with pin-outs. So I took one garbage BM54 NG, unsolder the whole PCB with pin-outs and solder it to BM54 Back OG and it works like I write in my first post.
So far, so good. I decided to flash the memory with latest firmware, supporting CD MP3 Text and....woalla I have fully working and real BM54 NG.