Ventoy is not bootable

[visionhelp]

My main partition is now unformatted.

I had many ISOs on my installation and now everything is gone.
What should I do to recover my Ventoy USB?
I think it was overwritten somehow by windows commands:

bootrec /rebuildbcd

Nearly the same trouble for me: did repair a Win10-Bootloader error, with bcdboot (... /all) command. From a Ventoy stick with the Win10 - iso on it.
The Win10 boots again, but the Ventoy stick now just is read-only, no matter, with what I try to get access to the stick. (format, delete, attributes and so on).

Your partition, which is shown as unformatted, I reckon the isos are gone with.
There is an update option, alternativly - also there with at - the Ventoy installation. Which works well at little errors.
But unformatted is not a little thing.

I know a good recovery software from EaseUS, EaseUS-Data-Recovery or similar.
But I do not know, whether there is still the former 1 GB free recovery offer.
But I am also not sure, it can solve this trouble, with much luck, I think, You could get the isos back. But there I fear, it could be more and more than 1 GB all in all.