How to increase the volume of HD900 ?
Update Time:2016-08-19
1st, Please change your TF card into FAT32 format;
2nd, After releasing the upgrade firmware http://www.flysight.com/otherbar1734686.htm and move it at the root of TF card;
3rd, Please ensure HD900 is turned off and then press Power & Volume+ button at the same time. HD900 will start to upgrade after 6seconds. Thank you !
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