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[Docs] Add section about EEPROM on ARM (#5070) 

* [Docs] Add section about EEPROM on ARM

* Add Preonic firmware

* Update docs/faq_build.md

add hyperlink

Co-Authored-By: yanfali <yanfali@gmail.com>
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Yan-Fa Li 2019-02-18 08:50:22 -08:00 committed by Drashna Jaelre
parent fc06986989
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@ -132,3 +132,11 @@ brew uninstall --force avr-gcc
brew install avr-gcc@7
brew link --force avr-gcc@7
```
### I just flashed my keyboard and it does nothing/keypresses don't register - it's also ARM (rev6 planck, clueboard 60, hs60v2, etc...) (Feb 2019)
Due to how EEPROM works on ARM based chips, saved settings may no longer be valid. This affects the default layers, and *may*, under certain circumstances we are still figuring out, make the keyboard unusable. Resetting the EEPROM will correct this.
[Planck rev6 reset EEPROM](https://cdn.discordapp.com/attachments/473506116718952450/539284620861243409/planck_rev6_default.bin) can be used to force an eeprom reset. After flashing this image, flash your normal firmware again which should restore your keyboard to _normal_ working order.
[Preonic rev3 reset EEPROM](https://cdn.discordapp.com/attachments/473506116718952450/537849497313738762/preonic_rev3_default.bin)
If bootmagic is enabled in any form, you should be able to do this too (see [Bootmagic docs](feature_bootmagic.md) and keyboard info for specifics on how to do this).