Early last month, Nikon has released a firmware update for a handful of their entry-level dSLR cameras (D3100, D3200, D5100 and D5200), as well as the CoolPix P7700. But this seemingly harmless update may just very well be a wolf in sheep’s clothing.
Nikon claims that the said upgrade will improve the camera’s ability to accurately gauge the remaining charge of the battery (EN-EL14/EN-EL14A). What they didn’t mention though in the changelog is that the update will cause the camera to ignore third-party batteries and battery grips.

The Japanese camera maker remains mum about this bug on the new firmware. To make matters worse, there’s currently no fool-proof fix to revert back to the old firmware, unless you want to risk bricking your camera in the process.
This is definitely something to consider if you’re thinking about upgrading your camera’s firmware, particularly if you’re using a third-party accessory with your gear. We’re hoping that none of you guys were affected by this bug, and if you are, please share your experience on the comments field below.
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A company’s good trick to gain more profit.
That’s why most of the time, I wait and check for feedbacks first for those software/firmware updates.
But if you don’t use third party batteries, there’s no need to worry about this.