Sound link mini 2 not turning on after using the wrong charger

Hi everyone, hoping someone here can help me out.

I made the mistake of using a LiPo battery charger on my Bose SoundLink Mini 2 and it hasn’t worked properly since. I think it has damaged the charge controller or possibly the main board.

I have already replaced the battery and boost PCB board (part number 088772) with a brand new one but nothing has changed. I tried doing a firmware update through btu.bose.com but the computer won’t detect the speaker through the micro USB port. I have also tried multiple button reset combinations including holding the power button for 30 seconds and the forced firmware sequence A, D, V, Up Arrow, Down Arrow but none of it has worked. I have left it on wall charge for a good while too.

At the moment the only thing it does is flash yellow when I hold the multifunction button while connected to power. The computer doesn’t detect it at all through micro USB even with a known data cable. The gold charging contacts seem fine and the PCB looks clean with no burn marks or anything obviously wrong with it.

What I really want to know is whether there is any kind of hardware level reset possible on the main board, and whether this could be a blown charging IC or fuse that someone could identify and replace. Also wondering if the main board itself is replaceable.

Any advice would be really appreciated, I’d love to save this speaker if at all possible. Thanks