EFS Explorer is a full-fledged file manager that helps to work with the "contents" of the device. For example, the QPST Configuration module allows you to select a COM port to work with the device, RF Calibration and TM Application tools are used to calibrate and test the RF path, respectively. The tools in this package are used for the most operations. Most often, the need to use this program is mentioned in the manuals for "firmware" of various Android-devices. QPST stands for Qualcomm Product Support Tools.
Also, these chipsets serve as a "heart" for some modems, because Qualcomm is one of the largest players in the CDMA and 3G networks market.
They are installed in many smartphones and tablets made by Samsung, Huawei, Lenovo, ZTE, Nokia. QPST is a set of tools that are designed to change some important Qualcomm chipset parameters.
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