If you encounter difficulties when trying to initialize the SD card via the EZVIZ APP, below are some troubleshooting steps to resolve the issue for you:

1. Ensure both the firmware of your camera and EZVIZ APP are running on the latest version.

2. Ensure the SD card is class 10 or rated at UHS-1. The file format of the SD card should be FAT32 for capacities below 64GB and exFAT for capacities of 64GB and above. Click Here to view partial test results of SD card compatibility.

3. Power off your camera, remove and reinsert the SD card, power the camera on and then initialize the card again on the EZVIZ APP.

4. To further rule out the SD card issue, you may try to test with a different SD card or install the card in question on another EZVIZ device. 

5. Try to factory reset your camera by holding the Reset button. This will turn the device to the default factory settings and might help resolve minor issues.

Regarding your issue, please kindly note that since the human body temperature is generally constant at around 37 degrees which emits infrared rays with a specific wavelength of about 10um, PIR detection is based on the induction of the infrared rays emitted by the human body.

Therefore, the detection accuracy is highly affected by the installation conditions and environment. You could choose to do the below modification to improve the PIR detection accuracy:

1) It is advised to install the device at a height of around 2-3 meters above the ground and at an angle of 20 degrees downward;

2) Ensure the device is kept away from air conditioners, refrigerators, stoves, and other areas like directly facing the window where the air movement is active;

3) Try to avoid obstacles and interference such as huge furniture and large bonsai;

In addition, please note that it is also related to the direction of the human movement. The PIR sensor is the least sensitive to the radial movement response, and the most sensitive to the transverse direction (that is, the direction perpendicular to the radius) movement.

Meanwhile, when the ambient temperature increases in summer, and the ambient temperature and the human body temperature might become relatively close, the detection function and sensitivity of the sensor might decrease, and sometimes the triggering might be not very sensitive as well.

If you're encountering difficulties charging your EZVIZ camera, here are some steps you can take to troubleshoot the issue:

1. Check the power source: Make sure the power outlet you're using is working properly. You can also try plugging the camera into a different outlet.

2. Check the power cable: Make sure the power cable is not damaged or frayed. You may also try using a different charging cable to see if that solves the problem.

3. Reset the camera: If there is still remaining power in the camera, you can try resetting the camera by pressing and holding the reset button for about 10 seconds. This will typically restore the camera to its default settings and may help resolve any charging issues.