My Passport - Win10 - shown as Read Only

[witty]

Hi,

My Passport WDBYFT0040BBK (4GB/NTFS) is connected to my PC (Win10) incl. password-protection.
Everything was working fine during last months.
The unlock still does work - “SMART status”, short and long drive-tests are also ok.

But when I want to write to the device, it tells me, that it is read-only.
Reading is still possible!

Formatting is currently no an option, as I don’t own any device bigger than 500MB

Any ideas?

thanks

[witty]

… even formatting does not work - as the request is rejected as being read-only!!!

[witty]

even formatting within “WD Drive Utilities” fails!