Since official sources are gone, use these community/archive resources:
The USB drive must be formatted to FAT32 . NTFS or exFAT file systems will not be recognized by the device.
If the update process does not go smoothly, use these common solutions to resolve the issue: grundig sonoclock 890 web firmware update repack
✅ if possible (requires serial dump).
If your goal is to fix a broken internet connection rather than add features, you might not need a firmware update at all. You can often reconfigure the existing software: Since official sources are gone, use these community/archive
Grundig (now part of the ARNEL Group) has largely discontinued active firmware support for older Sonoclock models. Official update servers may be offline. This guide focuses on repack methods—community-driven or local file updates.
Here's a step-by-step guide to updating the firmware on your Grundig Sonoclock 890 using the web firmware update repack method: If your goal is to fix a broken
Are you interested in to a custom station list (like YCast)?
Ensure the firmware file is not nested inside a subfolder or zip archive. The bootloader can only read files placed directly on the main root directory of the drive.