In the Automotive world they do NOT use little batteries to retain settings when power is off
They use non volatile flash memory, just like your mobile phone does, but much smaller
On devices I have repaired in the past the memory chip was easy to replace and cost all of 1.50 EUR.
BUT you have to have a memory chip reader to read out the contents of the old flash to then store in the new flash.
Even way back then, 15 years ago, I used a friends workshop where he had such tools
Have understood this correctly:- The user memory is retained as long as a power supply is connected; the memory chip which retains that data when the power supply is disconnected has failed; therefore is it not a practical solution to connect a permanent power supply to overcome failure of the memory chip? This would by-pass the need for a technically specialist repair or risky second hand replacement.
Grubby
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