Firmware link:
www.htek.com/upfile/File/201901/30/Htek_UC926_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC926E_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC924E_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC924_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC923_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/31/Htek_UC903_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC912E_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC912_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC912G_Firmware_2.0.4.6.15.zip
www.htek.com/upfile/File/201901/30/Htek_UC902_Firmware_2.0.4.6.15.zip
Firmware Release Note:
www.htek.com/upfile/File/201901/30/Htek_IP_phones_Release_Notes_of_Version_V2.0.4.6.15.pdf