Sorry for the late reply due to the National Day.
Regarding your issue, you can try to install the latest firmware to check.
Here is the link for you.
https://mega.nz/#!ZYFCGIZY!vlVpc2S_zPiz … xD2mRZkC60
For the volume issue, you can enter the settings–factory settings(126)–others to set the “wheel3”.
For the radio keep changing, you need to turn off the AF and TA after you search the stations.
For the inconsistent volume levels between apps, sorry about this, this unit can only support to set the volume level of the the default apps, such as Radio, TV and Bluetooth.
For the android 6.0, currently we don’t have the new update, if it’s available in the future, we can post it here.
For the Bluetooth tethering, this unit does not support it.
For the return policy, the warranty time is one year, even beyond one year, you can still return it back to us for repair.
Within 7 days, you can return the unit back to get refund or exchange whatever the reason.
Statistics: Posted by Jammy — Fri Oct 07, 2016 9:03 am