Flashing new firmware... can it be done?

• 

  Derth

  12/2/25, 7:50 PM

  I have tried flashing meshtastic 2.7.15 via both Bluetooth and Serial and "404 cannot connect/download."

  Is this device "locked" or only stable with the outdated FW? 

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• 

  Derth

  12/2/25, 8:27 PM

  nvm, figured it out in another forum.

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• J

  John

  12/9/25, 12:30 AM

  got a link ?   Was this a special firmware for the Spec5 ? 

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• 

  Daniel_spec5 Team Member

  12/9/25, 3:23 PM

  @John we use standard Meshtastic Firmware

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• J

  John

  1/9/26, 6:41 PM

  I can't get my device into DFU mode to save my life...  I've tried all the "tricks"... did you struggle in any way to flash it ? 

   

  The console log on https://flasher.meshtastic.org/ shows the following.

  TRACE 2177.000 No serial data received.
  CyBz3lTz.js:209 TRACE 2484.000 Read 39 bytes: 
      617665642050433a 3078343030353037 | aved PC:0x400507
      62370d0a77616974 2073706920646f77 | b7..wait spi dow
      6e6c6f61640d0a                    | nload..
  CyBz3lTz.js:209 TRACE 2484.000 Read invalid data: 
      617665642050433a 3078343030353037 | aved PC:0x400507
      62370d0a77616974 2073706920646f77 | b7..wait spi dow
      6e6c6f61640d0a                    | nload..
  CyBz3lTz.js:209 TRACE 2484.000 Remaining data in serial buffer:                 
  CyBz3lTz.js:51 Error reading from serial port: Error: Read timeout exceeded
      at CyBz3lTz.js:211:703
  Mr.<computed> @ CyBz3lTz.js:51
  CyBz3lTz.js:209 TRACE 2587.000 No serial data received.
  CyBz3lTz.js:51 Error reading from serial port: Error: Read timeout exceeded
      at CyBz3lTz.js:211:703
  Mr.<computed> @ CyBz3lTz.js:51
  CyBz3lTz.js:209 TRACE 2689.000 No serial data received.
  CyBz3lTz.js:51 Error reading from serial port: Error: Read timeout exceeded
      at CyBz3lTz.js:211:703
  Mr.<computed> @ CyBz3lTz.js:51
  CyBz3lTz.js:209 TRACE 2793.000 No serial data received.
  browser-intake-us5-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubfe30382f9dbafa02e02d4c19f6278f48&dd-evp-origin-version=6.18.0&dd-evp-origin=browser&dd-request-id=00420090-23ee-427e-a113-929a34985b6e&batch_time=1767984942294&_dd.api=fetch-keepalive:1  Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
  browser-intake-us5-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pubfe30382f9dbafa02e02d4c19f6278f48&dd-evp-origin-version=6.18.0&dd-evp-origin=browser&dd-request-id=0248fdb3-82a8-42dd-b822-bf293b320f4f&batch_time=1767984942297&_dd.api=fetch:1  Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
  CyBz3lTz.js:51  POST https://browser-intake-us5-datadoghq.com/api/v2/logs?ddsource=browser&dd-api-key=pubfe30382f9dbafa02e02d4c19f6278f48&dd-evp-origin-version=6.18.0&dd-evp-origin=browser&dd-request-id=a7f09e81-571d-4f92-b182-0c463d4127bc net::ERR_BLOCKED_BY_CLIENT
  a @ CyBz3lTz.js:51
  A4 @ CyBz3lTz.js:47
  s @ CyBz3lTz.js:47
  gC @ CyBz3lTz.js:47
  hC @ CyBz3lTz.js:47
  send @ CyBz3lTz.js:47
  (anonymous) @ CyBz3lTz.js:51
  finish @ CyBz3lTz.js:51
  u @ CyBz3lTz.js:51
  (anonymous) @ CyBz3lTz.js:47
  (anonymous) @ CyBz3lTz.js:45
  notify @ CyBz3lTz.js:45
  u @ CyBz3lTz.js:51
  (anonymous) @ CyBz3lTz.js:51
  zs @ CyBz3lTz.js:45
  (anonymous) @ CyBz3lTz.js:45
  CyBz3lTz.js:51  POST https://browser-intake-us5-datadoghq.com/api/v2/logs?ddsource=browser&dd-api-key=pubfe30382f9dbafa02e02d4c19f6278f48&dd-evp-origin-version=6.18.0&dd-evp-origin=browser&dd-request-id=cc047194-58ab-4b28-8990-69729e9788ab net::ERR_BLOCKED_BY_CLIENT
  a @ CyBz3lTz.js:51
  Vm @ CyBz3lTz.js:47
  (anonymous) @ CyBz3lTz.js:47
  zs @ CyBz3lTz.js:45
  (anonymous) @ CyBz3lTz.js:45
  Promise.catch
  A4 @ CyBz3lTz.js:47
  s @ CyBz3lTz.js:47
  gC @ CyBz3lTz.js:47
  hC @ CyBz3lTz.js:47
  send @ CyBz3lTz.js:47
  (anonymous) @ CyBz3lTz.js:51
  finish @ CyBz3lTz.js:51
  u @ CyBz3lTz.js:51
  (anonymous) @ CyBz3lTz.js:47
  (anonymous) @ CyBz3lTz.js:45
  notify @ CyBz3lTz.js:45
  u @ CyBz3lTz.js:51
  (anonymous) @ CyBz3lTz.js:51
  zs @ CyBz3lTz.js:45
  (anonymous) @ CyBz3lTz.js:45

  the screen is blank, AFAIK this means its in DFU mode, but still unable to flash it 

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• 

  Theo P. Admin Team Member

  1/13/26, 5:50 PM

  @John, Under normal use, does the device boot normally? I.e. does the device only boot up with a blank screen when you try to put it in DFU mode? 
  
  If you're using Windows, when the Ranger Magnum is in DFU mode, the option that pops up in flasher to connect to the device should say "USB JTAG...". 
  
  Let me know if you've got any more questions!

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