The settings of 2014 and 2018 beacons

Dear all,

i am facing an issue in all of my beacons after releasing the new 2018 beacons, dont know why all of them is not working now with me in my system.
I need the best setting for the beacons to trigger the proximity notifications by the IOS and Android since it was working perfectly for 2 years.
which packet need to be on and which need to be off ?? i think this is the thing changed with estimote …
please help

Another question : for the 2018 beacons , i have changed by mistake the major and minor for 2 beacons , how can i return them back since they stop sending any notification even when i changed the same major and minor in my CMS to be same.

thank you