[solved] Wrt3200acm 4.14 downgrade to 4.9 ubifs problem

I tried the staging patches for 4.14 and the networking (wired pard) did not worked so I flashed back an 4.9 kernel image, but after the flash I get this error

[ 8.180438] UBIFS error (ubi0:1 pid 777): ubifs_read_superblock: on-flash format version is w5/r0, but software only supports up to version w4/r0

how can I force format that partition ?

or should I try to force write a factory image ?

solved with
ubiupdatevol /dev/ubi0_1 -t


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