Hi,
For port SU870 rom to P720, you can compare ICS roms of P920 and SU760 to look for differences between them to see what is reason of up side down camera.
This are the sources of these roms:
https://www.lg.com/global/support/opensource/opensourceList?types=ALL&search=Optimus+3D
https://www.lg.com/global/support/opensource/opensourceList?types=ALL&search=cx2
Sorry for my english.
For port SU870 rom to P720, you can compare ICS roms of P920 and SU760 to look for differences between them to see what is reason of up side down camera.
This are the sources of these roms:
https://www.lg.com/global/support/opensource/opensourceList?types=ALL&search=Optimus+3D
https://www.lg.com/global/support/opensource/opensourceList?types=ALL&search=cx2
Sorry for my english.
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