How to safely disassemble watch while bootlooping?

Hi @dave33211

The safest course of action would be to let the battery discharge to a point where the watch turns off by itself and then open and disassemble to watch to fix it.

Silica beads etc won't solve the problem of corrosion caused by the water coming into contact with the metals on the motherboard in the watch, especially since power is still available on the motherboard, (electrolysis). Turning the watch off doesn't disconnect power from the board, it simply places the watch in an extremely low power state, same as in mobile phones.

The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the watch's operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away

First do not try to charge or to turn on your watch and once it has stopped you need to dis-assemble the watch and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better

Here is a link that describes the process. Electronics Water Damage

As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well

Hopefully after you have done all this the watch might possibly work correctly again.

Here is the ifixit Samsung Galaxy Watch Active2 guide that may help

If this process seems too daunting, take your watch to a reputable, professional phone repair service, experienced in liquid damage repair and ask for a quote for a repair.