How can the MF281 be flashed locally?

How can the MF281 be flashed locally?
The Telekom software is currently on it and only online flash is offered there.

not sure what locally means, but https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=1e1695f959e678868bb7911d059b847f38fc9cf4

files are at https://downloads.openwrt.org/releases/22.03.2/targets/ath79/nand/

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