iap4e.bin - How to Download
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You may find that you need a file called iap4e.bin in order to update/upgrade the firmware on your Duet2 control board. I know of at least two people who have had this problem. This file can be somewhat hard to find at the moment because it doesn't seem to be included in the newer versions of the Duet firmware. Here is a github link to an older version of the firmware which does include this file. Simply put it in your duet file system and proceed with the update:
https://github.com/dc42/RepRapFirmware/releases/tag/v1.19.2
I hope this helps.
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I think the most recent versions (if there were even any changes, i'm not actually sure) can be found in the last 1.x version release. 1.21
