@Support Dasaita
Regarding the BT issue, specifically with Android Auto, I installed the latest upgrade:
scout OS3.4
telenav_s4c_rk3399_10.0_ota(20230731)
https://www.dropbox.com/scl/fi/keamd1e2phuw39qwbt4yb/update.zip?rlkey=t5uh3dr608z00j8zrgzj36w85&dl=0
To review, The phone and headunit BT pair to each other immediately. Then the phone seems to have a notification of "Searching for AA". I finally figured out that if you let the phone and head unit sit for about 5 minutes, sometimes more, Z-Link will eventually start AA on the head unit. I think this started after an AA software update about a few months ago. Before that time, AA and Zlink worked perfectly. It does the same now wirelessly or via USB.
I found that if I clear the storage for the AA app on the phone, Zlink will immediately connect - but only the first time. Of course you have to setup AA for all your connected cars again.
When this delay occurs, BT is paired to the headunit and the phone.
No problem with the phone on other car's head units. They all pair and start AA immediately.
Previous version I had running was Scout 10 Version OS3.4 telenav_s4c_rk3399_10.0_ota(20230512)
Any advice? I cannot seem to find anyway on the headunit to clear the cache for AA, Zlink or BT on the headunit itself? Clearing the BT or AA cache on the phone does not help. I tried unpairing the phone on both the phone and head unit - no help. Only thing that helps is clearing storage on AA on the phone and that only helps the first time it pair up - after that it take over 5 minutes for Z-Link to pair.