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If you're going to do all the work to change from HU_Entry to HU_EntryNAV (change headunit, change screen, code car), I would HIGHLY recommend just going full out and upgrading to NBT EVO. I just retrofitted my car that came with HU_Entry and its a WORLD of difference.
This being said I don't think you can even upgrade HU_Entry to HU_EntryNAV, or at least not easily. The reason the Entry > NBT evo swap works relatively smoothly is because the combox isnt needed anymore and the gps and wifi antennas live under the dash because the new ones are so small. HU_EntryNAV needed the combox and the gps and radio hardware lived in the sharkfin on your roof. So this might be even more difficult if you need to change those components as well.
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