AX3600 with openwrt - how to flash stock firmware

Hey, im running openwrt on my ax3600 and i want to go back to the stock firmware. I tried via root (also for 0)
fw_setenv flag_last_success 1
fw_setenv flag_boot_rootfs 1

and i put the stock firmware via winscp in the /tmp and did
sysupgrade -F /tmp/miwifi_r3600_firmware_aba17_1.1.19.bin

both with no success. what can i do to go back to stock firmware?

thanks

nobody? im to new to openwrt to flash back :frowning:

https://openwrt.org/toh/xiaomi/ax3600#tftp_recovery will probably work.