If you missed it deliberately then you cannot pray, and if you missed it due to legitimate reason then you have to make it up as soon as you remember and do not delay it.

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You can recite different surah in different order. You can recite a verse or a set of verses in one Rakah and another set from a different surah in another Rakah.

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If this is a hanafi masjid and the time of Fajr during Ramadan is way earlier than after Ramadan, you must follow the app as they shouldn’t be trusted with fasting, as they call it way later than when it was due.

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