Security patch no longer supported android phone I have a nextbit robin. Unfortunately they are no longer pushing out updates for them. Is there a way I can manually patch or am I better off installing a different ROM like cyanogenmod?
If nextbit has open sourced it then you can build it and it will work. But this is an overkill for this purpose as in order to install you have to unlock bootloader and install a custom recovery.

So installing a custom rom look a better option.