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(~g_tpdu.packet[1]) == byte can never be true. Unary ~ applies the integer promotions first, so for tpdu INS = 0xA4 lhs should be 0x5B but as int it gets zero extended to at least 16 bits and then flipped, so it is 0xFFFFFF5B = -165, byte promotes to 0..255. The ack was therefore dead code -> fallthrough to SW1 branch, fails 0x6x/0x9x test, TPDU gets flagged SNIFF_DATA_FLAG_ERROR_MALFORMED from what I can tell. But I am losing track of all these arcane issues to be honest. Narrow the complement back to 8 bits. Fyi this is unrelated to signedness and not specific to ARM. Change-Id: I800f50ef35356429d07aa685ea919e70ec34946e