Use Lagrange method to find the mass matrix of the two-link robotic device. The masses and moments of inertia of the two links are m1, m2, I1, and I2.

Ithink you should continue to put it in the rice or try to dry it with a hair blower or go to a phone repair place so they can get as much water out as possible, these may or may not work so sorry if it doesn’t

You should either take it to a phone repair shop or try and fix it yourself, look at wiki hows on fixing your phone from water damage.