I've searched and searched and can't seem to find any real info on the ROM revision differences for BoP. Here's the situation:
I have a Bride running P-4. My son has a Bride running L-4. So for me it's easy to compare my game vs. his game. I believe the P is prototype revision and L is production. My prototype P-4 is missing all kinds of little speech and lighting effects especially at game over as compared to the L-4. It is also missing the moving heartbeat blip on the display as it displays just a flat line during metamorphosis.
My son's, running L-4, seems like everything is correct except when shooting up the left ramp to the mini playfield. The gate to the mini playfield will not close if it drops down the hole to the pops. Sometimes you have to hit that left ramp 6 times before it goes past the hole and down one of the two heartbeat ramp lanes. Once it hits one of the switches at the top of the heartbeat ramp the gate closes. Setting the mini playfield adjustment to easy or hard makes no difference. So I'm wondering if this is an issue in L-4?
So what would upgrading to L-6 fix and is it the recommended ROM? I'm not adding LEDs so don't need L-8.