# Unable to recover from Hard Fault

**URL:** <https://community.particle.io/t/unable-to-recover-from-hard-fault/31127>\
**Category:** Troubleshooting\
**Created:** [March 30, 2017, 12:55pm UTC](https://community.particle.io/t/unable-to-recover-from-hard-fault/31127 "2017-03-30T12:55:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Leah](https://avatars.discourse-cdn.com/v4/letter/l/c89c15/32.png) [@Leah](https://community.particle.io/u/Leah)\
**Post date:** [March 30, 2017, 12:55pm UTC](https://community.particle.io/t/unable-to-recover-from-hard-fault/31127/1 "2017-03-30T12:55:24Z")

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Hello,

After applying 2V to the photon instead of 5V the device entered hard fault. The code is the same for a long time so no new modifications. Unable to enter safe mode, device reenters hard fault. After entering DFU mode, I did a particle update and a particle flash --usb tinker. Both commands appear to have been run succesfully but the photon remains in Hard Fault.  
I am unable to enter setup mode or forget the existing Wifi credentials.

What would be the next step to try and recover it? (I have a STlinkV2 though I have never use it -if it might help)

Thank you.

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**Author:** ![KyleG](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/kyleg/32/11077_2.png) [@KyleG](https://community.particle.io/u/KyleG)\
**Post date:** [April 1, 2017, 4:50am UTC](https://community.particle.io/t/unable-to-recover-from-hard-fault/31127/2 "2017-04-01T04:50:38Z")

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Hello,

Let me ping someone that might be able to help. @rickkas7 are you able to assist here?

Kyle