This command is not allowed IMEI

Hello, I have a Lenovo smartphone A7000-a which had a software issue due to system update, so after finding the right firmware and flashing it, I got another problem, I cannot update my IMEI number, every time I try to send the command it tells me “this command is not allowed in userbuild”, putting space “ “ between AT and + doesn’t solve it, I tried different locations but that didn’t work, it’s driving me crazy after spending days searching for the right Firmware I found myself stuck to do a simple task.

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0


crwdns2889612:0crwdne2889612:0 0