AX3600 problem after install OpenWrt

I do exacly what write in https://openwrt.org/toh/xiaomi/ax3600#install_the_firmware

I miss unlock SSH because i have unlocked before (with that https://docs.google.com/document/u/0/d/14wylcOZzRMbXyP0_6ABJ8cocRNGhkLiGJprVpvioy44/mobilebasic - i use that software near 4months

Propobly its problem because i copy to putty that command:

ubiformat /dev/mtd13 -y -f /tmp/openwrt-ipq807x-generic-xiaomi_ax3600-initramfs-factory.ubi -s 2048 -O 2048 && nvram set flag_boot_rootfs=1 && nvram set flag_last_success=1 && nvram commit

and that should be 4 command ...
but its strange because i make after reboot sysupgrade and done correct

TFTP i try but cant copy file to router .... when I add it manually (by scp)... to the /tmp/tftp directory and hit the reset button (when led orange light blink) - it doesn't restore the firmware

i try do this today Xiaomi AX3600 install guide :
first fw_printenv to check - all looks goods but i cant open web site (login page)

root@OpenWrt:~# fw_printenv
bootcmd=tftp
bootdelay=5
SN=29010/E0RV32138
ethaddr="00:AA:BB:CC:DD:10"
ipaddr=192.168.31.1
serverip=192.168.31.100
stdin=serial
stdout=serial
stderr=serial
wl0_ssid=Xiaomi_A435_5BCA_5G
wl1_ssid=Xiaomi_A435_5BCA
wl0_radio=1
wl1_radio=1
no_wifi_dev_times=0
uart_en=1
telnet_en=1
flag_boot_type=2
flag_ota_reboot=0
boot_wait=on
color=101
CountryCode=PL
miot_did=377037064
miot_key=G82FZgBUEESznyBj
wl2_ssid=Xiaomi_A435
nv_wan_type=pppoe
flag_boot_success=1
mode=Router
model=R3600
nv_pppoe_name=r(login)pppoe2
nv_pppoe_pwd=N(pass)0
Router_unconfigured=0
nv_sys_pwd=c3a4525a520d788a59bfc257ca2ffedac2f89d6b
nv_wifi_ssid=s252
nv_wifi_enc=mixed-psk
nv_wifi_pwd=12348765
nv_wifi_ssid1=s252_5G
nv_wifi_enc1=mixed-psk
nv_wifi_pwd1=12348765
restore_defaults=0
ssh_en=1
nv_device_id=d6efef64-9d14-7116-9fde-5e3bf7b8980b
nv_channel_secret=SP2WEFyEvUlWH9YYYVtpaF0WlTFDc8sCpe2wFc+FRWM=
nv_wan_dns1=8.8.8.8
nv_wan_dns2=1.1.1.1
flag_boot_rootfs=0
flag_last_success=0
flag_try_sys1_failed=8
flag_try_sys2_failed=8

later i want restore :

root@OpenWrt:~# fw_setenv flag_last_success 1
root@OpenWrt:~# fw_setenv flag_boot_rootfs 1
root@OpenWrt:~# ubiformat /dev/mtd12 -y -f /tmp/xiaomi1.0.67.ubi
**ubiformat: error!: please, first detach mtd12 (/dev/mtd12) from ubi0**

and i want ubidetach and have:

root@OpenWrt:~# ubidetach -f -p /dev/mtd12
ubidetach: unrecognized option: f
Use -h for help
root@OpenWrt:~# ubidetach -F -p /dev/mtd12
ubidetach: unrecognized option: F
Use -h for help
root@OpenWrt:~# ubidetach -F -p /dev/mtd12

finaly its busy ... how to release the device?

root@OpenWrt:~# ubidetach -p /dev/mtd12
ubidetach: error!: cannot detach "/dev/mtd12"
           error 16 (Resource busy)

i can give access to that router (via other pc) - can someone help to solve problem ?