I read the 187A had half the RAM of the B and early B units sold on aliexpress were just A units with new RAM soldered onto the board. Be nice if someone could confirm that.
As to my own question, it fixed the volume bug which was so annoying - volume doesn't reset when you change track in android auto or just bluetooth player on the head unit now.
Yeah, the RAM part is true but it should still be enough for the most part.
I never had that bug on my previous firmware.