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KeyCombo.md

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Key Combos {#key_combos}

There are times when your Flipper feels blue and doesn't respond to any of your commands due to a software issue. This guide will help you solve this problem.

Basic combos

Hardware reset

  • Press LEFT and BACK and hold for a couple of seconds
  • Release LEFT and BACK

This combo performs a hardware reset by pulling the MCU reset line down. Main components involved: Keys -> DD8(NC7SZ32M5X, OR-gate) -> DD1(STM32WB55, MCU).

It won't work only in one case:

  • The MCU debug block is active and holding the reset line from inside.

Hardware Power Reset

  • Disconnect the USB cable and any external power supplies
  • Disconnect the USB once again
  • Make sure you've disconnected the USB and any external power supplies
  • Press BACK and hold for 30 seconds (this will only work with the USB disconnected)
  • If you haven't disconnected the USB, then disconnect it and repeat the previous step
  • Release the BACK key

This combo performs a reset by switching SYS power line off and then on. Main components involved: Keys -> DD6(bq25896, charger).

It won't work only in one case:

  • Power supply is connected to USB or 5V_ext

Software DFU

  • Press LEFT on boot to enter DFU with Flipper boot-loader

It won't work only in one case:

  • Flipper boot-loader is damaged or absent

Hardware DFU

  • Press OK on boot to enter DFU with ST boot-loader

It won't work only in one case:

  • Option Bytes are damaged or set to ignore the OK key

DFU combos

Hardware Reset + Software DFU

  • Press LEFT and BACK and hold for a couple of seconds
  • Release BACK
  • Device will enter DFU with an indication (Blue LED + DFU Screen)
  • Release LEFT

This combo performs a hardware reset by pulling the MCU reset line down. Then, the LEFT key indicates to the boot-loader that DFU mode is requested.

It won't work in two cases:

  • The MCU debug block is active and holding the reset line from inside
  • Flipper boot-loader is damaged or absent

Hardware Reset + Hardware DFU

  • Press LEFT, BACK and OK and hold for a couple of seconds
  • Release BACK and LEFT
  • The device will enter DFU without an indication

This combo performs a hardware reset by pulling the MCU reset line down. Then, the OK key forces MCU to load the internal boot-loader.

It won't work in two cases:

  • The MCU debug block is active and holding the reset line from inside
  • Option Bytes are damaged or set to ignore the OK key

Hardware Power Reset + Software DFU

  • Disconnect the USB and any external power supplies
  • Press BACK and LEFT for 30 seconds
  • Release BACK
  • The device will enter DFU with an indication (Blue LED + DFU Screen)
  • Release LEFT
  • Plug in the USB

This combo performs a reset by switching the SYS power line off and then on. Next, the LEFT key indicates to the boot-loader that DFU mode is requested.

It won't work in two cases:

  • Power supply is connected to USB or 5V_ext
  • Flipper boot-loader is damaged or absent

Hardware Power Reset + Hardware DFU

  • Disconnect the USB and any external power supplies
  • Press BACK and OK and hold for 30 seconds
  • Release BACK and OK
  • The device will enter DFU without indication
  • Plug in the USB

This combo performs a reset by switching the SYS power line off and then on. Next, the OK key forces MCU to load the internal boot-loader.

It won't work in two cases:

  • Power supply is connected to USB or 5V_ext
  • Option Bytes are damaged or set to ignore the OK key

Alternative ways to recover your device

If none of the described methods helped you:

  • Make sure the battery charged
  • Disconnect the battery and connect again (requires disassembly)
  • Try to flash the device with ST-Link or another programmer that supports SWD

If you're still here and your device is not working: it's not a software issue.