Reassembled the LXR housing, checked the SD card pins and the 4050 IC for seating/solder points. All fine.
Forgive my ignorance, here is the complete story of this mess-up:
- built my own "LXR 1"
- took a brand-new Sandisk SD card for installation…
The 0.24a FIRMWARE.BIN on the SD can be opened with a text editor and shows SPFI as initial letters. The size is approximately 249 kb.
I re-copied the 0.24a (non user sample) file to SD, still it showed the same size and could be opened with a text…
Unzipped the SD card image and flashed firmware 0.21. LXR runs.
Trying to update to 0.24a now tells me "header error". Repeated several times with two different SD cards. No difference.
I have been running 0.24a only a few times before switching to the beta firmware with user sample loading. Did not test all functions of the LXR, but I cannot remember that I had to re-flash the unit.
Probably, I will "downgrade" to the non-user-sa…