T-Mobile HTC One M9 update is coming to improve the rear camera, BlinkFeed and more
In order to download and install the update, T-Mobile requires that you be connected to a Wi-Fi nework when going through the updating process, and demands that your battery be charged to at least 50%. You need to have at least 88MB of free storage available. It will go out OTA between April 20th and April 24th. The update will bring the T-Mobile variant of the HTC One M9 in line with the Verizon and Sprint versions of the phone.
As we've noted in our review of the handset, the new 20MP rear camera is a welcome improvement from the 4MP UltraPixel camera that was featured on the back of the HTC One (M7) and HTC One (M8). But we noted that the One M9's camera did not turn out impressive shots in low-light conditions. However, that might change as the update does improve pictures taken with the rear snapper under all conditions.
source: T-Mobile via AndroidCentral