Help with Sonic toothbrush hacking

I need help with Sonic toothbrush hacking

I am wondering if any of the experts here could answer any of these questions with the limited information that I can provide

Information that I have:

The Philips toothbrush has a two minutes turn off timer!

a 30 second quad spacer (brief pause of vibration) every 30 seconds

The pcb has a TI MSP430G2412 microcontroller ( https://www.ti.com/product/msp430g2412 ) with the additional markings of “ 21K G4 “ and “ AS&F A ” on it.

It drives an electromagnet that consists of two coils, at approximately 1 MHz

Most of this and some more is visible on the pictures of the pcb and the assembly that I included.

My QUESTIONS are:

1, What is the easiest way to disable or change the 2 min power off timer??

(I very much would prefer not to reprogram or to replace the microcontroller, but if there is no other way than )

2, Is it possible to reprogram this specific controller and if yes is it possible to do so without disordering it?

I know it is a long shot, but I hope that one of you creative people can help me with a solution.
Thank you very much for your time spent thinking about this!

The TI docs say:
"Serial Onboard Programming, No External Programming Voltage
Needed, Programmable Code Protection by Security Fuse"

If the fuse has not been blown, you may have a chance.. you would need to probe the pins used for serial programming an enablement, they may have been strapped in which case you would need to lift the pins to they arn't strapped... or... buy a Spin Brush!