If you happened to find out that the right and left sides of your Tolv cannot be paired automatically, and it shows Tolv and Tolv-L in the bluetooth list on your phone, please kindly read through the article below.
First, please try to 'forget' both of them on your phone first, and then try the factory reset again.
If it still does not work, press the buttons on both sides for 20 seconds to turn them off (they will be automatically removed from the bluetooth list on your device). Then put them back to the charging case, after 10 seconds, take BOTH of them out of the charging case at the same time.
Please do not press the button or do anything, let the two sides being paired by themselves, then search on your bluetooth list on your device to pair them with the phone again.
Please note the both sides shows "Sudio Tolv" and "Sudio Tolv-L" on the device might be caused by the users pressed the button to turn them on when taking them out of the charging case, or didn't take the two sides out of the charging case at the same time.
If it still does not work, please let the earphone 'rest' for 24 to 48 hours, during the time, please do not use them. After 48 hours, please turn them on again and try to pair, and see if the same issue occurs.