# How to diagnose rollback? (boot loop)

**URL:** <https://forum.legato.io/t/how-to-diagnose-rollback-boot-loop/6917>\
**Category:** Legato Application Framework\
**Created:** [April 28, 2025, 10:48am UTC](https://forum.legato.io/t/how-to-diagnose-rollback-boot-loop/6917 "2025-04-28T10:48:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jkappes](https://avatars.discourse-cdn.com/v4/letter/j/34f0e0/32.png) [@jkappes](https://forum.legato.io/u/jkappes)\
**Post date:** [April 28, 2025, 10:48am UTC](https://forum.legato.io/t/how-to-diagnose-rollback-boot-loop/6917/1 "2025-04-28T10:48:02Z")

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After applying an update I barely have enough time to do an `app info` before the chip starts rebooting a few times and ending up rolled back. The output of that `app info` shows all my apps except for `tools` are running and they all have legato.version: 21.05.2.rc2 which is almost the same as the output of `legato version` namely 21.05.2.rc2\_7f59219499ecf02274c4ac7575e4f8c5. Is this discrepancy the reason?

Oddly enough I used the legato base from the R17 components page: [https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-17-components/#sthash.ZCKSBBjJ.r0Jtabo5.dpbs](https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-17-components/#sthash.ZCKSBBjJ.r0Jtabo5.dpbs)  
I would assume the legato version to be exactly 21.05.2.rc2 after flashing it but it wasn’t.

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [April 28, 2025, 11:20am UTC](https://forum.legato.io/t/how-to-diagnose-rollback-boot-loop/6917/2 "2025-04-28T11:20:57Z")

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What have you downloaded to module to trigger the rollback?

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**Author:** ![jkappes](https://avatars.discourse-cdn.com/v4/letter/j/34f0e0/32.png) [@jkappes](https://forum.legato.io/u/jkappes)\
**Post date:** [April 28, 2025, 11:25am UTC](https://forum.legato.io/t/how-to-diagnose-rollback-boot-loop/6917/3 "2025-04-28T11:25:40Z")

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an update file made with mksys containing the aforementioned apps. Is this what you meant?

EDIT: I circumvented the issue. I applied a different update that didn’t cause the rollback and kept the apps that I could only briefly see with my previous attempts. I don’t understand why, but I’m satisfied for now.