ev3: Fix issues with flashing (some?) EV3s. #2352
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laurensvalk
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Dec 20, 2025
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EDIT: I'll collect some notes in the issue thread instead. |
jaguilar
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dlech
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Dec 23, 2025
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It seems like this is fixing at least 3 different things. So would be better to split it up into 3 commits.
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This fixes an issue where the EV3 firmware had checksums appended to it that made its size not align to the sector size, causing flashing to fail.
We don't use this datum for anything, and the rest of the flashing process apparently proceeds fine even if this fails. This could use further investigation, though.
Research in pybricks/support#2375 (comment) and below shows that erasing the firmware and writing it sector by sector causes hangs during the flashing process. Instead, we should erase the whole firmware at once, and flash it at once. This successfully loads new EV3 firmware without hangs.
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As requested, broke the change into separate commits. When we try to upload a firmware with the wrong size, we show this alert now, rather than asserting: 
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If the EV3 firmware size is not a multiple of the sector size, the flashing process will hang. Raise an error if this happens.
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Flash the EV3 all in one go rather than sector-by-sector. This appears to resolve issues we had with flashing (some?) EV3s, and mirrors what we do in pybricksdev.
Fixes pybricks/support#2375.