I don't think there were any significant changes in commands. You need to compare logs to see what happens.
I seen another chap post same error
David Moscoso 2 days ago
Has someone managed to change the update interval? I've already tried with (upload123456 "Time") but it does not work
checked all settings can you confirm upload to device does work on 3.16
I had the upload command to TK905 working fine on the 3.15 upgraded to 3.16 and i see its no longer working
I send a text command to the tk905 turn off led and change report time and works fine, send the same command from the portal and nothing happens as though its not working anymore?
do I need to change anything in the config file to make this work?