Help - Bangle.js 2: Stuck in Bootloop, DFU update not helping

in linux you can convert base64 text back to binary via base64 command from coreutils which should be installed by default in any linux distro. Something like this works for me in WSL when first saving the output as text file in windows 10 (with DOS line endings)

grep '==' backup.txt | dos2unix | base64 -d >backup.bin

grep command filters just base64 encoded lines (lines ending with ==) so there can be also the initial code or any other logged text. if the log is complete the resulting binary file should have exactly 8MB. However you don't need to do this, just zip the text log if possible (to make it much much smaller) and upload somewhere.