Try decoding “A3jk9s” from base36 to decimal: A=10, 3=3, j=19, k=20, 9=9, s=28 → 10 36^5 + 3 36^4 + 19 36^3 + 20 36^2 + 9*36 + 28 = huge number (≈ 6.7e9) → Maybe a Unix timestamp seed.
According to GNS3 documentation, this specific image has the following requirements and identifiers: : 192 MB. C3660 A3jk9s Mz 124 25d Bin