How to install target applications via serial port

Hi all,
In our device, there are no ssh connection between wp76xx and the host cpu.
Are there any method to install applications from host cpu via serial port or via usb port?
We prefer using serial port to install target applications.
Thanks in advance for your suggestions.

You can transfer .update file in UART console:

After that you can use “update xxx.update” in console to install the application

Thank you for your advice.
I’ve just noticed the “update” command in Legato document!

Are there other methods to transfer files to the target via serial port without using lrz?
Because lrz is not included in the device when we populate the device to the board, we can’t utilize lrz for this purpose.
I’d appreciate your advice.

you can put the binary in http server and download it by wget command