twrp – E1001: Failed to update the latest Onplus 5T system image and other

I have downloaded the latest LineageOS for my latest device, Dumplings SF.

firmware, recovery, provider files.

I get the error message "E1001: System Image Update Failed" all the time and the inability to mount the vendor partition.

Ideas ? PS: I can not even remember the latest Oneplus ROM (or even an older ROM) ….
For any help, I thank you kindly.

best, Tamer

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