Used Mibro A1 Watch, inside the water pool, Now Button won't work

I took my mibro A1 watch into the water, Used it to check the time & went to swim again. After sometime the main(Upper) button stopped working.

Now the button is completely broken, It won't work at all.

secondly, I was somehow still using with 1 button & touch controlls. One day I got an indication that battery is low and It has to go into the power saving mode. I touched ok. So now the watch is permanenty into the ulta power saving mode which shows only time and the key to unlock it from that is the upper button which is broke.

Please help me out to atleast remove it from ultra power saving mode, somehow.