# Can't get skr e3 v3 bootloader working **URL:** \ **Category:** General Discussion\ **Created:** [April 6, 2024, 3:14am UTC](https://klipper.discourse.group/t/cant-get-skr-e3-v3-bootloader-working/15538 "2024-04-06T03:14:05Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ggenovez](https://avatars.discourse-cdn.com/v4/letter/g/85e7bf/32.png) [@ggenovez](https://klipper.discourse.group/u/ggenovez)\ **Post date:** [April 6, 2024, 3:14am UTC](https://klipper.discourse.group/t/cant-get-skr-e3-v3-bootloader-working/15538/1 "2024-04-06T03:14:05Z")
### Basic Information: Printer Model: Ender 5 pro MCU / Printerboard:skr e3 v3 Host / SBC klippy.log ### Describe your issue: Hi all, I’m trying to flash klipper on my BTT SKR E3 V3.0. I already have klipper on but trying to update. I followed the instrucitons from [https://www.youtube.com/watch?v=uNW8phiV83w&t=1s](https://www.youtube.com/watch?v=uNW8phiV83w&t=1s) but when I try the flash-sdcard.sh I get a failure. I tried ./scripts/flash-sdcard.sh /dev/ttyAMA0 btt-skr-mini-e3-v3 ./scripts/flash-sdcard.sh /dev/serial/by-id/usb-Klipper\_stm32g0b1xx\_26000B001450415833323520-if00 btt-skr-mini-e3-v3 ./scripts/flash-sdcard.sh /dev/ttyACM0 btt-skr-mini-e3-v3 All give me Flashing /home/ggenovez/klipper/out/klipper.bin to /dev/ttyAMA0 Checking FatFS CFFI Build… Connecting to MCU… SD Card Flash Error: Unable to connect to MCU Traceback (most recent call last): File “/home/g/klipper/scripts/spi\_flash/spi\_flash.py”, line 1647, in main spiflash.run() File “/home/gklipper/scripts/spi\_flash/spi\_flash.py”, line 1584, in run self.run\_reactor\_task(self.run\_reset\_upload) File “/home/g/klipper/scripts/spi\_flash/spi\_flash.py”, line 1570, in run\_reactor\_task k\_reactor.run() File “/home/g/klipper/klippy/reactor.py”, line 292, in run g\_next.switch() File “/home/g/klipper/klippy/reactor.py”, line 340, in \_dispatch\_loop timeout = self.\_check\_timers(eventtime, busy) File “/home/gklipper/klippy/reactor.py”, line 158, in \_check\_timers t.waketime = waketime = t.callback(eventtime) File “/home/g/klipper/klippy/reactor.py”, line 48, in invoke res = self.callback(eventtime) File “/home/g/klipper/scripts/spi\_flash/spi\_flash.py”, line 1518, in run\_reset\_upload self.mcu\_conn.connect() File “/home/g/klipper/scripts/spi\_flash/spi\_flash.py”, line 1202, in connect raise SPIFlashError(“Unable to connect to MCU”) SPIFlashError: Unable to connect to MCU Any help would be greatly appreciated. Thanks ---
**Author:** ![ggenovez](https://avatars.discourse-cdn.com/v4/letter/g/85e7bf/32.png) [@ggenovez](https://klipper.discourse.group/u/ggenovez)\ **Post date:** [April 6, 2024, 3:37am UTC](https://klipper.discourse.group/t/cant-get-skr-e3-v3-bootloader-working/15538/2 "2024-04-06T03:37:52Z")
Ok. I’m an idiot. I forgot to stop the service. once I did it connected but I might have bricked the BTT I ran the script and got Checking FatFS CFFI Build… Connecting to MCU…Connected Checking Current MCU Configuration…Done MCU needs restart: is\_config=1, is\_shutdown=1 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: 15761408 manufacturer\_id: 255 oem\_id: product\_name: SD08G product\_revision: 2.32 serial\_number: 00000083 manufacturing\_date: 12/2019 capacity: 7.5 GiB fs\_type: FAT32 volume\_label: b’’ volume\_serial: 405344664 Uploading Klipper Firmware to SD Card…Done Validating Upload…Done Firmware Upload Complete: firmware.bin, Size: 26120, Checksum (SHA1): F4C460613E42BC920347FC5A867FBB18CE80F0CD Attempting MCU Reset…Done Waiting for device to reconnect…Error Now it won’t show on my RPI. I put the firmware.bin on the sd card and rebooted. nothing. I don’t see it flashing and I don’t see it in my /dev/serial/ folder. Having one of those nights ☹ ---
**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 6, 2024, 7:11am UTC](https://klipper.discourse.group/t/cant-get-skr-e3-v3-bootloader-working/15538/3 "2024-04-06T07:11:45Z")
It is possible that you have not correctly set the parameters during `make menuconfig` Strictly follow [BIGTREETECH-SKR-mini-E3/firmware/V3.0/Klipper at master · bigtreetech/BIGTREETECH-SKR-mini-E3 · GitHub](https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/tree/master/firmware/V3.0/Klipper) and make sure it is really a SKR-mini-E3-V3.0 ---
**Author:** ![ggenovez](https://avatars.discourse-cdn.com/v4/letter/g/85e7bf/32.png) [@ggenovez](https://klipper.discourse.group/u/ggenovez)\ **Post date:** [April 6, 2024, 2:57pm UTC](https://klipper.discourse.group/t/cant-get-skr-e3-v3-bootloader-working/15538/4 "2024-04-06T14:57:19Z")
NICE! not only did that work I have a partial working BTT screen Put the [display] below and now it shows marlin mode and touch mode but doesn’t go further than that. ```auto [display] lcd_type: emulated_st7920 spi_software_miso_pin: PD8 # status led, Virtual MISO spi_software_mosi_pin: PD6 spi_software_sclk_pin: PB9 en_pin: PB8 encoder_pins: ^PA10, ^PA9 click_pin: ^!PA15 [output_pin beeper] pin: PB5 ``` ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [May 7, 2024, 12:57am UTC](https://klipper.discourse.group/t/cant-get-skr-e3-v3-bootloader-working/15538/5 "2024-05-07T00:57:40Z")
Closed on May 7, 2024, 12:57am UTC This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.