Topics created by LordMM

@lordmm If you're on 1.21, you need to use the iap4e.bin from 1.21: https://github.com/Duet3D/RepRapFirmware/releases/tag/1.21
I recently tested updating from old firmware versions. You should be able to update from 1.21 to 2.05.1, then 3.0, then to 3.4. See https://forum.duet3d.com/post/268028

I also tested updating from 1.21 directly to 3.0, which also worked. Just make sure you have the correct 1.21 iap4e.bin version in the sys folder of the SD card.

Ian