On Onion 4.3.0 with either MMP v3, (new 2024 batch device); or RTC mod on MM/MMP./ MinUI 23. Nov. 2024
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Unzip to root of sd-card
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Boot device with inserted sd-card
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Navigate to Apps/ Tweaks/ System/ Date and time... Turn emulated time skip to -Off-
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Then navigate to Apps/ clock... Set time.
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Enjoy
Credit goes to @tGecko from the Onion team