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Alternatively, check similar product schematics to see if similar 8-pin DIP chips are used in them.
I'd guess that it is an 8 pin PIC microcontroller such as a 16F18313, with their own software and markings.
The pinout makes that a possibility; power on 1, ground on 8. Having pin 4 set as an input and tied to ground as it is, would prevent anyone using an in circuit programmer or debugger, I believe?