Hi amaurynieto. I believe that C20 v5 is not the same as C20W v5. The "W" means that it is the version for ISPs. What I discovered is that the C20W v5 has the same partition table that the C20 v4 and I was able to flash it by tftp by settting up a server with IP 192.168.0.66 and pressing the reset button while booting.
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