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What are the things to be noted or considered if a software which was initially treated as DAL C and later wanted to be considered as DAL A?

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    $\begingroup$ Read DO-178C and look for the different requirements between level A and C. $\endgroup$ – Daniel K Jun 24 '18 at 16:27
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    $\begingroup$ This question is understood by software developers familiar with certification requirements. $\endgroup$ – Pilothead Jun 26 '18 at 12:33
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The main difference in effort is in the amount of verification required.

Design Assurance Level (DAL) C only requires statement coverage whereas DAL A requires MC/DC coverage.

Some of the DO-178C objectives have to be meet with independence where they didn't need to be previously, and some life cycle data goes from CC2 to CC1.

I would suggest looking at the objective tables A1-A10 in DO-178C

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