Just to help others following this thread. Here is the AQR Firmware file size before and after adding MBN header.
-rw-r--r-- 1 root root 393218 Oct 26 14:53 AQR-G4_v5.6.5-AQR_WNC_SAQA-L2_GT_ID45287_VER24005.cld
-rw-r--r-- 1 root root 393258 Oct 26 15:42 AQR-G4_v5.6.5-AQR_WNC_SAQA-L2_GT_ID45287_VER24005+MBN.cld
Check sums
Before MBN: AQR-G4_v5.6.5-AQR_WNC_SAQA-L2_GT_ID45287_VER24005.cld
md5sum : 4f54d6bc597efa72420c058cd1266116
sha256sum : c517a3e0da47848866dec21cc1cb8fb21e8adb9e0d5755ba60b335d04d6da953
After MBN: AQR-G4_v5.6.5-AQR_WNC_SAQA-L2_GT_ID45287_VER24005+MBN.cld
md5sum : 94585e0b2476de456b0c5571b06fbb47
sha256sum : 7da49e3913e2a679eb258114b9b3c60fbfb374e8d4482f950807e353d4762247