Unlocking the bootloader of the Sony Xperia Z3 Compact decreases low-light camera performance, developers warn
According to Magnus Sandin, the reasons for this reported behavior are the missing DRM security keys in devices with an unlocked bootloader, which leads to the malfunctioning of the “proprietary image processing”. Usually, DRM keys usually have nothing to do with the camera performance and image-processing algorithms, but it looks like this is the case with the Xperia Z3 Compact in particular.
While the manufacturer warns that unlocking the bootloader of its devices might cause unexpected issues, such as non-functioning preloaded content, inaccessible secure user data partition, no more official software updates, and in the worst-case scenario, malfunctioning hardware and overheating. No mention about an under-performing camera performance of sorts.
At this point , the issue seems to be irreversible, so you should really think twice before rooting and treating your Xperia Z3 Compact to a custom Android firmware. Hopefully, that is not the case with its bigger brother, the Sony Xperia Z3.
You can check out some Sony Xperia Z3 Compact camera samples in our review of the power-laden device.
source: @MagnusSandin via XDA