Reimage ASA to FTD

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 1. The following guide has detail about load FTD boot image in Rommon mode


https://www.cisco.com/c/en/us/td/docs/security/firepower/quick_start/reimage/asa-ftd-reimage.html


2. In addition to above guide, we can load boot image via USB key.

   2.1 Insert USB key when device is running ASA image
   2.2 USB key is disk1, copy FTD boot image from disk1 to disk0 (flash)
   2.3 change boot var to use FTD boot image
   2.4 reboot 
   2.5 continue pkg file installation

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