Thank you for the service log. We will check it if we can find a cause for the problem. In the mean time, please do also try to update using the other phone.
Attempting to pair to another phone has risk of losing the existed pair connection. Does the bootloader specifically support the BT re-pairing function? If not, I’d suggest to first wait for your diagnosis of the log.
As long as it is in bootloader, you don’t need to pair.
And all our product can store pairing information for multiple phones. So when you pair with a new phone, the old one is also still able to connect without repairing (as long as you do not change or reset the pincode using the new phone).
The problem you are experiencing is a little bit different as it stays in the bootloader while all data has been sent and it should at that point go to the new application.
A cause for this could be a “sticky” button. When you keep this button pressed on startup/reboot the charger stays in the bootloader. So when the button sticks to the presses position, it always stays in its bootloader. Please try to press the button a few times to see whether this helps.
Another thing to try is try to update with another phone. This phone does not first need to pair, but it should ask for the pincode at the end of the update.
A third reason could be that the internal storage of the charger is malfunctioning. This would mean the charger is broken beyond repair and can be replaced under warranty (seeing the age based on the serial number).
So first try a power cycle after pressing the button a few times and then try an update with another phone.