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Have you tried without the TF? And do you still have the other RTC to try out. At least you can rule out your A500 motherboard.
When I had similar RTC issues on my A500+ - it was not found or the clock was not ticking - I tried reflowing the pins of the sockets and components. But this was on a battery damaged A500+
Eventually I replaced the RTC chip itself and it was working and stable since then.
It is a shame the RTC chip on your memory board is not socketed, but you can still replace it if you have the tools and skillset. However, since it is new you might want to consider returning it and getting a replacement, but you should try to rule out your A500 motherboard first.
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