# Bug: spi\_flash.py not working on BTT boards with SD\_SPI\_SPEED = 400000 **URL:** \ **Category:** General Discussion\ **Created:** [December 5, 2022, 8:06pm UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243 "2022-12-05T20:06:10Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![nick](https://avatars.discourse-cdn.com/v4/letter/n/f9ae1b/32.png) [@nick](https://klipper.discourse.group/u/nick)\ **Post date:** [December 5, 2022, 8:06pm UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243/1 "2022-12-05T20:06:10Z")
### Basic Information: Printer Model: Voron Switchwire MCU / Printerboard: BTT SKR Mini E3 V3 Klipper Version: v0.11.0-0-ge02b7256 `klippy.log` - unneeded in this context Shell output [spi\_flash\_shell\_output.txt](https://klipper.discourse.group/uploads/short-url/k4IJQai5kzGrjr7Az1ACipMMyCT.txt) (3.4 KB) ### Describe your issue: In [SKR 1.4 Turbo Problem with spi\_flash: reduce speed to 400K · Issue #5465 · Klipper3d/klipper · GitHub](https://github.com/Klipper3d/klipper/issues/5465), a user found that reducing the SPI Flash speed (variable SD\_SPI\_SPEED) down to 400K was causing issues with the SD card update script needed for updates on BigTreeTech boards. This issue was closed, but I’ve been experiencing it for months and manually working around it. Resetting the variable to the previous 4000000 (4M), enables this script to work with the SKR Mini E3 V3 board. Unclear to me why this is the case, but I think this issue should be reopened. ---
**Author:** ![philgood](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/philgood/32/4955_2.png) [@philgood](https://klipper.discourse.group/u/philgood)\ **Post date:** [April 10, 2023, 3:08am UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243/2 "2023-04-10T03:08:08Z")
**Basic Information:** - Printer Model: Voron 2.4 - MCU / Printerboard: Spider 2.2 - Klipper Version: v0.11.0-169-g83308a10 - klippy.log - unneeded in this context - Shell output: **Describe your issue:** The error message with spi speed set to default: 400K ```auto Flashing /home/pi/klipper/out/klipper.bin to /dev/ttyAMA0 Checking FatFS CFFI Build... Connecting to MCU...Connected Checking Current MCU Configuration...Done MCU needs restart: is_config=1, is_shutdown=0 Attempting MCU Reset...Done Waiting for device to reconnect...Done Connecting to MCU...Connected Initializing SD Card and Mounting file system... SD Card Flash Error: Failed to Initialize SD Card. Is it inserted? Traceback (most recent call last): File "/home/pi/klipper/scripts/spi_flash/spi_flash.py", line 1647, in main spiflash.run() File "/home/pi/klipper/scripts/spi_flash/spi_flash.py", line 1587, in run self.run_reactor_task(self.run_sdcard_upload) File "/home/pi/klipper/scripts/spi_flash/spi_flash.py", line 1570, in run_reactor_task k_reactor.run() File "/home/pi/klipper/klippy/reactor.py", line 292, in run g_next.switch() File "/home/pi/klipper/klippy/reactor.py", line 340, in _dispatch_loop timeout = self._check_timers(eventtime, busy) File "/home/pi/klipper/klippy/reactor.py", line 158, in _check_timers t.waketime = waketime = t.callback(eventtime) File "/home/pi/klipper/klippy/reactor.py", line 48, in invoke res = self.callback(eventtime) File "/home/pi/klipper/scripts/spi_flash/spi_flash.py", line 1542, in run_sdcard_upload self.mcu_conn.configure_mcu(printfunc=output_line) File "/home/pi/klipper/scripts/spi_flash/spi_flash.py", line 1359, in configure_mcu self._configure_mcu_spibus(printfunc=printfunc) File "/home/pi/klipper/scripts/spi_flash/spi_flash.py", line 1328, in _configure_mcu_spibus "Failed to Initialize SD Card. Is it inserted?") SPIFlashError: Failed to Initialize SD Card. Is it inserted? ``` Change SD\_SPI\_SPEED = 4000000 ```auto Flashing /home/pi/klipper/out/klipper.bin to /dev/ttyAMA0 Checking FatFS CFFI Build... Connecting to MCU...Connected Checking Current MCU Configuration...Done MCU needs restart: is_config=1, is_shutdown=0 Attempting MCU Reset...Done Waiting for device to reconnect...Done Connecting to MCU...Connected Initializing SD Card and Mounting file system... SD Card Information: Version: 2.0 SDHC/SDXC: True Write Protected: False Sectors: 62333952 manufacturer_id: 3 oem_id: SD product_name: SE32G product_revision: 8.128 serial_number: 2174F315 manufacturing_date: 8/2019 capacity: 29.7 GiB fs_type: FAT32 volume_label: UNTITLED volume_serial: 2130514434 Uploading Klipper Firmware to SD Card...Done Validating Upload...Done Firmware Upload Complete: firmware.bin, Size: 26020, Checksum (SHA1): 7B08ECCCC5823C01FA284C6AAC7768F45091153F Attempting MCU Reset...Done Waiting for device to reconnect...Done Connecting to MCU...Connected Verifying Flash...Version matched...Done Firmware Flash Successful Current Firmware: v0.11.0-169-g83308a10 Attempting MCU Reset...Done SD Card Flash Complete ``` Reference GitHub issue [#5465](https://github.com/Klipper3d/klipper/issues/5465), which has been closed. What is the best way to reopen this ticket and change the board rate back to 4000000 (4M)? ---
**Author:** ![philgood](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/philgood/32/4955_2.png) [@philgood](https://klipper.discourse.group/u/philgood)\ **Post date:** [April 10, 2023, 10:08am UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243/3 "2023-04-10T10:08:13Z")
Hi @Sineos, sorry to ping you. Do you remember this SD\_SPI\_SPEED issue raised over at Github? [#5465](https://github.com/Klipper3d/klipper/issues/5465) I have been personally experiencing this issue and I have seen a few here in this forum having the same issue with the change of the SPI speed from 4M to 400K. Since the change last year I have no longer been able to flash the Spider via the flash-sdcard.sh. I have to manually change the SD\_SPI\_SPEED to 4M every time I git pull klipper. Since your username was on the original issue and you confirmed this was the issue, are you able to assist? ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [April 10, 2023, 10:26am UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243/4 "2023-04-10T10:26:06Z")
Actually this is quite strange. I had this issue once with my SKR 1.4T board (where I posted in the mentioned GH issue) but I have not been able to reproduce it. Directly flashing it works without a hitch and I flash really often. Maybe @Arksine has an idea. ---
**Author:** ![philgood](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/philgood/32/4955_2.png) [@philgood](https://klipper.discourse.group/u/philgood)\ **Post date:** [April 10, 2023, 10:41pm UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243/5 "2023-04-10T22:41:45Z")
Thanks for the prompt reply. Let’s hope @Arksine can shine some light on the change? ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [August 2, 2025, 12:21pm UTC](https://klipper.discourse.group/t/bug-spi-flash-py-not-working-on-btt-boards-with-sd-spi-speed-400000/5243/6 "2025-08-02T12:21:08Z")