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I've had three or four OTA updates via WiFi on my Mars (came with Android 8.1) and it's now "ByRead-V3.1.0-2021042314"
I'd guess the version number includes ISO date, so 2021-04-23 for the last release, but I could be wrong. Also there is no reason why different models would get updates at the same time.
The Mars doesn't offer updates without a manual check unless the automatic check is enabled, but I didn't enable that as I don't like updates unless something is obviously broken.
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