Failed to read (broken?) config

[ahaupt]

Hi,

I had an older version running for almost 2 years. Then I was hit by #1034 and flashed the current firmware (NRZ-2024-135/DE). After adapting the configuration once after the re-flashing, I cannot change the configuration any longer. There's something wrong:

airRohr: NRZ-2024-135/DE
mounting FS...
opened config file...
parsing json: IncompleteInput
failed to load json config
failed to open config file.
No Next PM... serialSDS 9600 8N1
output debug text to displays...
Connecting to Freifunk-disabled
........................................
output debug text to displays...
Starting WiFiManager
AP ID: airRohr-xxxxxxxx
Password: airrohrcfg
scan for wifi networks...
AP Password is: airrohrcfg
Starting Webserver... (IP unset)

Somehow the configuration is broken and I cannot fix it. How can I completely delete it? Re-flashing the firmware does not help at all.

Thanks, Andreas