Memory problems.Technobeam and Studiospot 575

I have some technobeams and studiospot 575 which badly or not boot

I suspect that the flash EPROM which have a lifespan of 20 years to give up.
I want to replace it whatsoever
who has a geprogameerde 29F040 for the technobeam and studiospot 575 ?

a file of the EPROM may also

greetings Theo

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