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- mini0806, mini0806S, mini0903/0905, mini0906, mini0808
they do actually have some engineering capability these days, but you are correct, it's a hardware fix that is needed, not a software workaround
yes it is hardware fault, the RTC battery damaged by heat. the MS412FE battery on board can only work -20 to 60 degree C, but the PCB heat it to 70 degree.
that is why we are sourcing MS612T, which is high temperature model up to 85 degree C