SP Flash Tool - Error 3154 when flashing super-sign.img to phone

So I bricked my UleFone Note 8 when trying to install a GSI ROM.

Have been trying to recover using SP Flash Tool.

Was getting the

Error 3154: BROM ERROR: S_DA_SDMMC_WRITE_FAILED (3154)​

every time I was trying to flash. So I decided to flash one file at a time.
All files went ok, except "super" (references to super-sign.img) It's a 2.1GB file.
So I can see, it's not a connection issue of any kind.

When I initially tried installing the GSI ROM, I experienced this error which resulted...

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