TFTP way is almost the same as via ssh+mtd.
I found the way (original link https://4pda.to/forum/index.php?showtopic=963314&st=160#entry104094788 )
Need to flash initramfs-kernel.bin (in my case openwrt-21.02.0-ramips-mt7621-asus_rt-ac85p-initramfs-kernel.bin) and I used TFTP method. After that squashfs-sysupgrade.bin from web-interface, if necessary.
I have restored the original firmware several times and tried again.
p.s. I thought the community was friendlier here.
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