I was wondering if there is any option available to keep coloros and enable dualboot and also have cyanogenmod installed?
Simply you cant, and most probably never will be able to. This has something to do with the partition layout and the difficulties with changing those combines with the different roms. You should make a bachup with twrp or cwm make a full wipe (except sd storage ofcourse) and install cm. If you dont like it simply restore your backup. Give cyanogenmod some time to settle before you decide wich rom fits your needs best.
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