new 3ds xl blue light blink after update, doesn't boot

[deatheory]

Hello,
yesterday I tried to update luma from lumaupdater.

Here's the log:

Checking for new Luma3DS Updater releases...
Downloading ...
Download progress: 4894 / 4894
Downloaded 4894 bytes
JSON parsed successfully!
Release found: v2.6
Changelog found.
Current updater is already at latest release.
Trying detection of current payload version...
10.2.1-c058e3f
Loaded existing payload in memory, searching for version number...
Downloading ...
Download progress: 6490 / 6490
Downloaded 6490 bytes
JSON parsed successfully!
Release found: 12.0
Found version: Luma3DSv12.0.zip
Release description found.
Downloading ...
Download progress: 8 / 8
Downloaded 8 bytes
Do you want to enable downloading boot.firm on CTR-NAND?
Press A + X to enable
Press B to disable


Enabling allows you to update the SD-less version of Luma3DS as well. If in doubt, you should enable this option.
CTR-NAND related operations disabled
Copying /boot.firm to /boot.firm.bak...
Downloading ...Luma3DSv12.0.zip
Download progress: 395119 / 395119
Download complete! Size: 395119
Integrity check #1 [OK]
Integrity check #2 [ERR]
MD5 mismatch between server's and local file!
FATAL
Could not get sighax payload...

The 3ds has/had boot9strap 1.2 installed and luma 10.2.1.
When I restart the console it doesn't turn on anymore, the blue LED turns on for half a second and turns off.
I've checked the microsd, it's ok.
I've copied the boot.firm luma 12.0 on the microsd, same failure.
Holding Start or Select before starting the 3ds doesn't trigger anything.
I've tried to copy old boot.firm Version to the microSD, nothing changed.
I've tried Godmode9 as boot.firm, it doesn't boot up as before.
I've searched every forum here and i don't know what to try next.

I would appreciate your suggestions very much.

 

[Bonnom]

I had this exact same issue. I copied the new luma files on linux to the sd card and it just wouldn't work!
Then I copied the files from windows to sd card and now it works!

It turns out that extracting/copying files with certain programs can cause this issue. For example extracting luma files from winrar to the sd card according to the troubleshooting page of 3ds.hacks.guide.

So what I would do is delete the boot.3dsx and boot.firm from the sd card and copy the files from windows explorer to the sd card.

Hopefully this will get the 3ds to work!