from Hikvision. There is no separate "premium" or "enhanced quality" firmware branch. What you might be looking for is the latest official firmware (which often includes bug fixes, performance enhancements, and security patches).
The "extra quality" firmware for the DS-7104HWI-SH is V3.4.92 build 170518 (or the latest build ending in 170929 for some regions). Do not attempt to install firmware from the DS-7104HWI- SL or DS-7104HGHI models—they are incompatible. hikvision dvr ds7104hwish firmware download extra quality
The primary source for the latest European and Global builds. from Hikvision
To download and install the latest firmware for your Hikvision DS-7104HWI-SH DVR , follow this guide to ensure a safe and successful update. Step 1: Download the Correct Firmware Because the DS-7104HWI-SH The "extra quality" firmware for the DS-7104HWI-SH is V3
Version V2.2.17 Build 150519 (May 2015) is widely cited as one of the final stable releases for the SH series.