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X728
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* User guide refer to [[X728-Software]]
===X728 V2.0(sold out)===
* PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.0.
* Improve the power path function, the battery will only charge and not discharge when connected to the PSU(power supply unit). [The PSU power will charge the battery and also pass through to the RPi when it has power. If the PSU loses power (power failure), the X728 will switch over to battery power.]
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===X728 V1.3(sold out)===
X728 V1.3 is released at Febuary 2021.
* Remove the hardware ASD function and change it to software implementation