Test results from running the a3a8.exe console software to obtain value of the "SRES".
Simply enter the hex values for "KI" and "RAND" and the software outputs the hex value for "SRES".
i think, knowledge about this the "a3a8" is considered sacred in this century where almost all root security verification, authentication, or tokenization systems use it the "a3a8" as a last resort!.
Because you only know the captcha, username, password, private key, and QR code but you never know that this "a3a8" is a last resort if all of the above success to penetrate by Mr. James Bond.