Change wifi access point Connect wi-me 9210

My problem is how to change the wifi access point with command line on a Connect Wi-ME, the device is already connected to the “Connect” SSID with no password but now I would like to put the device on my personal network I try some solution found on internet but it seems don’t working.

Second question is it possible to update BusyBox inside embedded linux because mine is a bit old
BusyBox v1.18.4 2011-11-24

Thanks in advance

standard linux approach should work.
something like
bring interface down with ifconfig
reconfigure and restart wpa_supplicant,
bring the interface up.
you can probably also achive this with iwconfig command.
DEL online help would have a syntax specific to the Atheros chipset this module is using.