https://docs.flipper.net/basics/firmware-update/firmware-recovery
Learn how to repair the firmware of your Flipper Zero

https://forum.flipper.net/t/flipper-zero-recovery-mode-dfu-doesnt-work/14787
Unplug Flipper Zero from the USB. If you do not disconnect the device from the power supply, the DFU mode will not activate. Press and hold the OK + BACK buttons for 30 seconds. Then release them. If the firmware is corrupted, there will be no indication on the screen—this is normal. Connect the device to the computer.

https://forum.flipper.net/t/flipper-stuck-in-dfu-mode/5501
Switch your Flipper to DFU mode and connect it to the computer. Right click on the DFU in FS Mode → select Update driver (Fig. 1) Select Browse my computer for drivers → Let me pick from a list of available drivers. Select Universal serial bus devices → WinUsb device → WinUsb device (Fig. 2-3) Click Next and Yes. Fig. 1.

https://docs.flipper.net/basics/reboot
Learn how to reboot your Flipper Zero normally, perform a hard reboot, or reboot to recovery mode

https://support.flipper.net/hc/en-us/articles/14114283967005-Troubleshooting
At this point, the DFU bootloader should have been activated, and the device is ready to proceed with firmware repair. ... Flipper Zero makes use of the SPI interface, and on many low-quality microSD cards the SPI mode is either poorly implemented or not supported. We recommend using high-quality, branded microSD cards such as SanDisk, Kingston

https://blog.flipper.net/new-firmware-update-system/
In DFU mode, the radio stack and the main Flipper Zero firmware are updated, as well as restored in case of firmware damage. From the very beginning of the Flipper Zero development, we have been looking for a way to update the firmware without switching to DFU, and finally, this work is finished!

https://docs.flipper.net/basics/first-start?ref=blog.flipper.net
2) Set Bluetooth to ON. 2. In Flipper Mobile App, tap Connect. 3. On the next page, next to the detected Flipper Zero's name, tap Connect. You can connect Flipper Zero to your phone via Bluetooth. 4. In Flipper Mobile App, enter the pairing code displayed on the Flipper Zero screen. 5.

https://support.flipper.net/hc/en-us/articles/17915168726429-If-the-device-doesn-t-power-on
On Linux: In the Terminal, run the lsusb command and ensure that STMicroelectronics STM Device in DFU Mode is connected. If your Flipper Zero fails to connect as a DFU device. Activate the DFU bootloader in a different way: Unplug the USB cable from your Flipper Zero if connected. Press and hold the BACK button for 30 seconds to perform a hard

https://docs.flipper.net/basics/firmware-update
Updating Flipper Zero. To update your Flipper Zero via Flipper Mobile App, do the following: 1. In the main tab, tap Update Channel and select desired firmware (Release is recommended). 2. Tap the Update button. 3. In the dialog window, tap the Update button to confirm the action.

https://www.ifixit.com/GuidePDF/link/158281/en
Step 2 — Recovery mode (DFU) In this mode, Flipper Zero activates the bootloader and is detected in the computer as a DFU device. When the firmware is updated, Flipper Zero enters the recovery mode on its own. To exit this mode, perform a reboot. Press the Back- and Left-buttons at the same time. Release the Back-button but don't release the

https://docs.flipper.net/qflipper/windows-debug
1. On your computer, close the qFlipper application if running. 2. Connect your Flipper Zero to the computer via a USB-C cable. 3. Go to Device Manager -> Ports (COM & LPT). 4. Check if you have Serial devices with the same COM port number. Check if you have two USB Serial devices with the same COM port number.

https://www.ifixit.com/Guide/How+to+reboot+the+Flipper+Zero/158281
Step 2 Recovery mode (DFU) In this mode, Flipper Zero activates the bootloader and is detected in the computer as a DFU device. When the firmware is updated, Flipper Zero enters the recovery mode on its own. To exit this mode, perform a reboot. Press the Back - and Left -buttons at the same time. Release the Back -button but don't release the

https://github.com/jamisonderek/flipper-zero-tutorials/blob/main/firmware/updating/README.md
These applications can be used to easily update the firmware on your flipper. Install an SD card. If needed, format the SD card If your flipper is not at the Flipper Desktop press the BACK button until you are at the Desktop. Press the OK button on the flipper to pull up the main menu. Choose "Settings" from the menu. Choose "Storage" fromthe

https://github.com/RogueMaster/flipperzero-firmware-wPlugins
Added: Simultanious UHF RFID Reader v1.0 (By RileyHaffner) Req: M6e Nano UHF RFID Reader & Raspberry Pi Zero; Updated: Five Nights at Flipper's v1.3 (By sillygir1) Temp disable FURI_TRACE crash msg, need more DFU (By Willy-JL) Fix depricated function in canvas (By xMasterX) Updated: BMI Air Mouse v1.2 (By ginkage) Req: BMI160

https://blog.flipper.net/quick-start-guide-and-shipping-update/
This is a manual for the first launch of Flipper Zero: it explains how to update the firmware, install databases to an SD card, and more. ... All problems related to DFU mode will disappear when we switch to the new self-update method using the SD card. After that Flipper will only be recognized as a COM port device during the update process.

https://forum.flipper.net/t/flipper-stuck-in-dfu/19269
Hello everyone, My Flipper Zero is stuck in DFU, this is how it happened : A morning while taking my Flipper it was locked, i never lock my Flipper so it was a bit unusual, i pressed the Back button three times but nothing happened, the time was correct so i didn't think the Flipper was frozen but i solve a lot of problem by hard rebooting it so i pressed the Left and Back button together

https://developer.flipper.net/flipperzero/doxygen/key_combos.html
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.

https://www.reddit.com/r/flipperzero/comments/uryg2t/problems_updating_firmware_gets_stuck_after/
Hmm, I tried this and it still doesn't work unfortunately. If I plug it in, non-recovery mode, it shows up in Zadig as Flipper [name] (interface 0). If I change to Update/Recovery Mode on the Flipper, Zadig has it listed as DFU in FS Mode (USB ID 0483 / DF11). The driver is listed as GuiSTDFUDev (v6.6.4.0) which I try to change to WinUSB driver."

https://www.reddit.com/r/flipperzero/comments/w5845l/update_process_failed_stuck_in_recovery_mode/
101670 [REG] Device went back online. 101720 [RCY] Exit Recovery Mode @Saperoms SUCCESS. 101720 [DEV] Firmware install from file @Saperoms SUCCESS. While it says SUCCESS, my Flipper Zero won't reboot. The screen hasn't been on since the first failed update process. Note, my W10 device shows the Flipper Zero as an unknown USB device.

https://www.reddit.com/r/flipperzero/comments/xn92ed/how_to_create_a_dfu_from_the_github_repo/
If your code is ready to compile, cd into the folder and use the included flipper build tool (fbt) to make an installable dfu through the included update app. I've had some trouble with the beginning of this script but the rest is the same no matter what. ./fbt or fbt —with-updater updater_package. 1. Reply.

https://forum.flipper.net/t/pc-is-recognizing-device-as-dfu-in-sf-mode-but-qflipper-is-not-able-to-repair/1946
To install, unzip the file, click "Update driver" on Flipper in DFU mode, select "Browse my computer for drivers" and then point the installer to the folder you have unzipped. STM32_Driver.zip (4.6 MB) 1 Like. JustGame32 May 6, 2022, 12:41am #18. So I finally received my flipper after all those years !

https://forum.flipper.net/t/failed-update-error-9-99/9291
I've tried the driver fix on this thread here (PC is recognizing device as DFU in SF mode but qFlipper is not able to repair - #12 by Anthony_Parabavidez) but it's the same result. It does appear to boot into a newly flashed device (though this could still be in a messed-up state and not apparent) I think it's having issues with the SD

https://github.com/EJRicketts/flipperzero-firmware-Unleashed
Connect your device and select Update from file then select flipper-z-f7-full-(CURRENT VERSION).dfu And wait, if all flashed successfully - you can manually upload IR libs and other stuff to sd card If you doing install for first time or migrating from official fw, unpack 2 folders from archive sd-card-(CURRENT VERSION).zip onto your microSD card