I am familiar with the differential cryptanalysis of small SPN-based ciphers like here: Tutorial of Amazing King with SPN (or mentioned in the book "The Block Cipher Companion" or the Tutorial of Howard Heys). So far so good.
I am familiar with the publication of Biham and Shamir and the Tutorial of Amazing King about the dca of FEAL-4 here FEAL-4 DCA. The Implementation of Amazing King does not apply the subkeys k8 to kb in the last round.
I am stuck on recovering the last subkeys and got no idea how to do that. May be someone can give me hint?