Sorry for double-posting, I forgot to add links.
http://www.flashdrive-repair.com/2017/10/chipgenius-v417-software-2017.html
http://www.flashdrive-repair.com/2017/10/lacie-usb-disk-storage-format-tool-v5.3.html
http://www.flashdrive-repair.com/2017/10/flash-drive-information-extractor-v85.html
http://www.flashdrive-repair.com/2018/09/45-way-to-repair-corrupted-usb-flash.html
These are the tool's I've seen, I think, + one more.
Also "firmware usb stick" would be a good search term I think. Because
rewriting the firmware - if possible and if you are able to locate the
proper firmware - will bring the stick to it's deault shipping-state.
Overwriting with zeroes should not be neccessary, as I checked a few
newly bought sticks and they all contained random data all over the
stick. I think the firmware does not care at all, what is stored in it's
flash chips.
Nils
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