Have you tryed to link the RC with AC following this exact procedure ?(...)
Since you are wondering about a version mismatch, I assume you are asking if somewhere in the DAT file is a reference to the FW versions? I'm sorry to say that I don't know. For me, the only thing I truly trust to determine the AC FW version is the LOG_AB file which is what was originally posted. To me, it appears that the AC has v1.11.20 as well as the classic 8/15 gimbal top (main) board fault which results in no image transmission as was noted by @3rdof5 .@Oso @Fly Dawg @msinger
Do you know if the DAT files are containing the AC firmware ?
Asking since @marcooo cannot link the AC to the RC, hence he cannot conclude if he is / isn't in the know situation where the 2 units are containing incompatible SW versions. If the ACs firmware will be known, then he might eventually downgrade the version from AC/RC to make them compatible. Later on, if althrough the 2 units become compatible in terms of their SW version, he still cannot link them, then I guess in question is a malfunction...