Alright, just finished updating my OnePlus 6 to Android 10.... and nope,
I'm still only getting "regular" TWS with the L2P rather than TWS+... which is a shame considering its SD845 proc. But eyyy, at least AptX is still working over TWS on OOS 10.3.2 stable, considering the myriad of Bluetooth issues I've heard the 10 Betas had.
So yeah, unless somebody manages to find a mod that adds the TWS+ code to the OP6 firmware, I'm probably SOL until upgrade to something else. EDIT: Apparently things aren't that simple, read EDIT2 below.
That said, one silver lining is that the SoundCore app seems to store its settings per account in the cloud. Reinstalling the app bought me back all my EQ settings and tweaks, which is a welcome bonus (vs having to set everything up again from scratch).
EDIT2: Well upon further digging, it seems that TWS+ is INDEED working on OOS 10.3.2 stable in the OnePlus 6, just not with the L2P. See spoilered screenshots below.
Here it's pretty clear that the COAs are connecting fine through TWS+ (both earbuds connected at once - further confirmed with a trip to Dev Options where "AptX TWS+" is selected with it connected). The L2P do not connect through TWS+, only through "normal" TWS, even if I tweak the settings around in Dev Opts AFTER connecting the buds (which might not even work lol) or prior to connection (in which case the settings simply don't stick for some reason).
So yeah, things are a bit sketchy at this point TBH. Either OP6 OOS 10.3.2 has a broken TWS+ implementation, or the L2P is just MADE to not connect through TWS+. Which I can only confirm if somebody else can make the L2P connect through another phone (or another OP6 custom firmware) in TWS+ mode (both earbuds connected, one side active).
To be fair though, connecting through TWS+ isn't all that different either (as far as it's implemented in the COAs anyway). Putting the "active" bud away still cuts connection for a short moment, before the other one automatically resumes in mono... so it's
not entirely seamless.
Only real difference with the L2P in TWS is that you have to press a button to resume on the "non-dominant" side compared to auto-resume (with a pause) on the COAs. Also, there's a possible L/R battery drain difference between TWS vs TWS+, but I don't really have multiple devices to test the COAs with (nor do I plan to, considering their
backup status).
Another thing I
have noticed however... is that for some reason, the COAs seem to sound a bit better back when it could only connect through "normal" TWS before I updated my OP6. Or at least that was how I remembered them to sound like. It might just be placebo and I can't confirm unless I can A-B both.