Please follow below PDF or videos to upgrade OTA.
USB Male to Male (Windows PC required):
PDF: https://firebasestorage.googleapis.com/v0/b/volcora-products.appspot.com/o/Android%20RK%20Terminal%2FRK3576-516_Firmware_Upgrade_Instructions_EN.pdf?alt=media&token=620ac69d-edc1-4c10-86f6-b719f496c4e4
Video: https://firebasestorage.googleapis.com/v0/b/volcora-products.appspot.com/o/Android%20RK%20Terminal%2FUSBGeneralOTAUpgrade_Nosound.mov?alt=media&token=a0d62415-48d2-4a38-ad1e-2fa282941bc0
Upgrade tool is also attached here: https://firebasestorage.googleapis.com/v0/b/volcora-products.appspot.com/o/Android%20RK%20Terminal%2FRK3576%20USBCable%20FirmwareUpdate-v3.30_EN.zip?alt=media&token=8ef16a6d-fe7a-4463-8938-c5fb3e3b773d
Not Bootable Android - Bareboard Update:
PDF: https://firebasestorage.googleapis.com/v0/b/volcora-products.appspot.com/o/Android%20RK%20Terminal%2FRK3576-516_Firmware_Upgrade_Instructions_EN.pdf?alt=media&token=620ac69d-edc1-4c10-86f6-b719f496c4e4
Video: https://firebasestorage.googleapis.com/v0/b/volcora-products.appspot.com/o/Android%20RK%20Terminal%2FBareBoard_OTAUpgrade_nosound.mov?alt=media&token=f0f4b950-d813-4c11-9310-658518ae4344
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