Default Flash/cam issues?

Hi,

I have a Chinese OPO running Color OS 1.2.0, flashed it and installed custom ROMs, 1st CM 11S and than Mahdi.

1. The issue is, earlier on factory Color, even in pitch dark the flash turned ON automatically and took a crystal clear pic. ( on any mode, flash is set at auto........ always)

2. With Custom ROMs pics aren't that crisp, but the main issue is it wont turn on the flash in dark EXCEPT in Auto mode, not in HDR.......any suggestions?

3. When I reverted back to Color OS now again it only turns on flash on Normal and Beauty not in HDR or Oneplus one modes.....any ideas why?

Thanks.


PS: I didn't take a back up of Color 1.2.0 for OPO, where could I download the original one that came with the phone?