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1  I bought 20 of these for my warehouse but they are not communicating. Is there a download I am supposed to do?
Under frequency and CTCSS is same, two radios can communicate with each other, so please confirm them same Please download H777 usb driver and H777 software from Retevis official website: http://www.retevis.com/resources-center/ Here's the blog for programming steps. Different model, steps same. Thanks. http://blog.retevis.com/how-to-programme-in-software-for-retevis-rt2-communication/
2  We bought 30 of these radios to be able to sound an alarm during a fire emergency. So far, we can not get the alarm to sound. What is the secret handshake to do this? The book says to use channel 11, turn it off, hold down transmit and moni and turn on; well, that doesn't send an alarm. We have tried with function set to incept alarm on and off. Please help.
Please turn on the alarm function in H777 software, attached a pic for you reference,After done, try it again
3  When I set my unit to channel 1, all i hear is a high pitched continous tone. But only on channel 1. All other stations are clear. Is there a way to fix this?. Thank you and I look forward to hearing from you.
please you adjust the squelch level in H777 software, then try it again
4  I recently bought a third H777. I checked when I first got it and it seemed to work fine but it has quit transmitting on any channel. How do I return it for replacement? Thank you.
please detail introduce your H777 questions, by the way, tell me your order number
5  Can not get H 777 software to install on system. windows 10
I'm sorry but could you try it on win8 please ?