Having problems moving from Padavan to Openwrt Xiaomi router ac2100

in my termainal i can't mtd

BusyBox v1.24.2 (2020-05-03 11:25:16 UTC) built-in shell (ash)
Enter 'help' for a list of built-in commands.

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Version: 3.4.3.9-099_f36c988

RM2100:/home/root # cd /tmp
RM2100:/tmp # cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00080000 00020000 "Bootloader"
mtd1: 00080000 00020000 "BootEnv"
mtd2: 00500000 00020000 "Factory"
mtd3: 00140000 00020000 "Kernel"
mtd4: 02ec0000 00020000 "RootFS"
mtd5: 00100000 00020000 "Config"
mtd6: 00400000 00020000 "Storage"
mtd7: 04480000 00020000 "RWFS"
mtd8: 03000000 00020000 "Firmware_Stub"
RM2100:/tmp # ls
dnsmasq.leases
hashes/
hosts.static
modem/
openwrt-21.02.0-rc4-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-kernel1.bin
openwrt-21.02.0-rc4-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-rootfs0.bin
rc_action_incomplete/
rc_notification/
static_ip.inf
static_ip.num
syslog.log
udhcpc_lan.script@
var/
RM2100:/tmp # mtd write openwrt-21.02.0-ramips-mt7621-xiaomi_redmi-router-ac2100-squashfs-kernel1.bin kernel1
-sh: mtd: not found
RM2100:/tmp # 

ask padwan, it's them who can't write to mtd due to missing binary.

or restore stock fw, and go to openwrt from there.

how do i restore to stock without mtd command

ask padwan, or check if your device have some other recovery method, like TFTP.

or perhaps https://hoddysguides.com/xiaomi-debrick-tools-all/#google_vignette

no idea how TFTP works but i have download to the tmp folder the required bin file

RM2100:/tmp # ls
dhcp6c.script@        ip6t_filter.default   ipt_mangle.rules      modem/                static_ip.num         wpacli.script@
dnsmasq.leases        ip6t_filter.rules     ipt_nat.default       ppp/                  syslog.log            zcip.script@
dnsmasq.servers       ip6t_mangle.rules     ipt_nat.rules         rc_action_incomplete/ udhcpc.script@        zcip_viptv.script@
hashes/               ipt_filter.default    ipt_raw.rules         rc_notification/      udhcpc_viptv.script@
hosts.static          ipt_filter.rules      miwifi.bin            static_ip.inf         var/
RM2100:/tmp # 

does the TFTP just copies the file over or runs the file, i have no idea