Zte mf287 how to remove all wrt files

i need to remove all the openwrt file from both nand/nor memories. i can connect to router via serial console and via ethernet/luci gui. do you know commands to execute? thanks

What are you trying to achieve, by doing it?

If you simply "remove" openwrt, you'll soft brick your router.

i dont want the router can't find any file from wich to boot from. i want to get rid from any openwrt trace. i d like just to leave the bootloader working. in case openwrt has been completely removed, will i be able to flash a new os (different from openwrt) trought tftp?