Serial connection on TD-W8970 and strange characters on putty

See installation_using_serial on the device page.
Basically you can interrupt boot using t button, use U-Boot shell to load openwrt-21.02.1-lantiq-xrx200-tplink_tdw8970-squashfs-sysupgrade.bin via TFTP and then write that to the flash as described in the guide linked above.
(I don't think you still need to set bootargs to board=TDW8970, that seems to predate the device tree migration of the Lantiq target long ago and doesn't have any effect with modern OpenWrt builds)

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Thank you so much, solved!!!

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