I have tried the adb in the sources list, e.g. apt-get install adb, same problem as I'm having with adb-dev/5.1.1/ compiled for arm by Eugen (https://raspberrypi.stackexchange.com/q ... spberry-pi). After removing the stock adb I copied the adb-dev to /usr/bin/ and can recognize the sideloaded device, a 2017 Amazon Fire purchased in Nov. 2018 from Amazon, and listed under devices by serial number and sideload. Same behavior as the stock adb.
I have the Fire firmware binary, a .bin file.
adb fails to read the file to push it to the Fire. Permissions are 0777 on the binary and adb is being run by root.
I note this is an rpi3 and this seems to be difficult at times. I'm tempted to go to an earlier rpi with a vanilla noobie install unless someone can help me get this done on the rpi3.