# Aza's Maslow 4.0 to 4.1 upgrade notes/questions

**URL:** <https://forums.maslowcnc.com/t/azas-maslow-4-0-to-4-1-upgrade-notes-questions/24402>\
**Category:** Troubleshooting\
**Created:** [June 19, 2025, 7:07pm UTC](https://forums.maslowcnc.com/t/azas-maslow-4-0-to-4-1-upgrade-notes-questions/24402 "2025-06-19T19:07:34Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Paul\_Langard](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/paul_langard/32/28629_2.png) [@Paul\_Langard](https://forums.maslowcnc.com/u/Paul_Langard)\
**Post date:** [July 6, 2025, 1:10pm UTC](https://forums.maslowcnc.com/t/azas-maslow-4-0-to-4-1-upgrade-notes-questions/24402/7 "2025-07-06T13:10:10Z")

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encountered the same problem, you have to upgrade the firmware, see [After Calibration: Maslow is not ready to move - Belt lengths are unknown](https://forums.maslowcnc.com/t/after-calibration-maslow-is-not-ready-to-move-belt-lengths-are-unknown/24392) 🙂

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