Preparing your file and uploading it to Flow VIN Tune

Upload the raw binary exactly as your read tool saved it. No zipping, no renaming the extension, no opening it in an editor "just to look" and accidentally re-saving.

Sanity-check the size against what your tool documents for your ECU — full reads are typically megabytes, not kilobytes. A tiny file is usually an export or a partial read and will be rejected.

Keep a second, untouched copy of the original somewhere it cannot be overwritten. This is non-negotiable insurance: it is your way back to stock.

The intake asks for your model, year, engine, ECU family, fuel, and any hardware changes. The tuner reads these answers next to your file — mismatches between the two are a common rejection cause.

If your car has modifications, declare them. A declared bolt-on changes which service fits; an undeclared one wastes a review round when the tuner spots its traces.

The order page gives you a secure upload slot. Pick your .bin and let it finish — large files over slow connections can take a few minutes; do not navigate away mid-transfer.

Every upload lands in quarantine first, where it is scanned and validated (size, type, structure) before anything else happens. Files that fail validation never reach a tuner — you get the reason instead.

Once validated, your file is fingerprinted with a SHA-256 hash and stored immutably as the order’s original. That hash follows every version of your file from here on — what the tuner reviews is provably what you sent.

Analysis runs next: the platform identifies your ECU from the file itself and, on supported families, proposes a candidate for the tuner. You can watch the order status move through these stages on the order page.

Nothing is delivered automatically at any point — a human tuner approves every file before download becomes possible.