Mimosa B5 update firmware from 1.5.1 problem

we wanted to upgrade a Mimosa B5 to the latest version and downloaded two files:
- Mimosa-B5-2.8.1.2.img.signed
- Mimosa-B5-2.9.0.img.signed

Problem:
the upgrade 1.5.1 to 2.8.1.2 didn't work, since the file could not really be uploaded.

Solution:
rename the file Mimosa-B5-2.8.1.2.img.signed to Mimosa-B5-2.8.1.img.signed, after that
the file could be uploaded and verified

The update from 2.8.1.2 to 2.9.0 was no problem

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